CXCR4 receptor antagonists

ABSTRACT

The compounds of formula (I) are antagonists of the CXCR4 receptor 
                         
Wherein R 1 , X, Y and R 2  are as defined in the claims.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser. No. 15/497,324, filed Apr. 26, 2017, which is a continuation application of U.S. application Ser. No. 14/852,835, filed Sep. 14, 2015, which is a continuation application of U.S. application Ser. No. 13/878,968 filed Jun. 11, 2013, now U.S. Pat. No. 9,353,086, which in turn is a National Stage application of PCT/EP2011/067946 filed Oct. 13, 2011, and published on Apr. 19, 2012 as International Publication No. WO 2012/049277, which application in turn claims priority to Great Britain application Serial No. 1017345.8, filed Oct. 14, 2010. Each application is incorporated by reference herein in its entirety.

INTRODUCTION

This invention relates to compounds that are CXCR4 antagonists, to compositions containing them, to processes for their preparation, and to their use in medicine, in particular for the treatment of conditions which respond to antagonism of the CXCR4 receptor, such as cancer (including cancers of the haematopoietic system such as multiple myeloma and non-Hodgkin's lymphoma, non-small cell lung, breast and neuroblastoma), cancer metastasis, HIV/AIDS, neuropathy, HIV related neuropathy, brain inflammation, diabetic retinopathy, age related macular degeneration, and retinal neo-vascularisation and to methods of preventing, treating or ameliorating these conditions. This invention further relates to the use of compounds which are CXCR4 antagonists for use in stem cell apheresis procedures including, for example, promoting release and mobilisation of stem cells, including haematopoietic and non-haematopoietic stem cells and progenitor stem cells, prior to harvesting.

BACKGROUND TO THE INVENTION

CXCR4 is a G-protein coupled receptor whose natural endogenous ligand is the cytokine SDF-1 (stromal derived factor-1) or CXCL12. CXCR4 was first discovered as a co-receptor, with CD4, for the entry of T-cell line-tropic (X4) HIV-1 into T-cells. CXCR4 manipulation (in combination with granulocyte colony stimulating factor (G-CSF)) has proven to improve the outcome of haematopoietic (Broxmeyer et al., 2005) and endothelial progenitor cell (Pitchford et al., 2009) stem cell mobilization. The CXCR4-SDF-1 interaction is also a master regulator of cancer stem cell trafficking in the human body (Croker and Allan, 2008) and plays a key role in the progression and metastasis of various types of cancer cells in organs that highly express SDF-1 (Zlotnik, 2008). In view of these important biological functions mediated by CXCR4, small molecule antagonists of the CXCR4 receptor are promising as future therapeutics for stem cell transplantation and for the treatment of diseases such as diabetic retinopathy, cancer, HIV and AIDS.

Haematopoietic Stem Cell Mobilization

Haematopoietic stem cells or HSCs are widely used in the treatment of cancers of the haematopoietic system e.g. multiple myeloma and non-Hodgkin's lymphoma. Mobilisation and harvesting of HSCs allows the use of cytotoxic drugs to kill the tumour cells within the bone marrow. Subsequently the haematopoietic system can be re-introduced using the previously harvested stem cells.

Normally stem cells and progenitor cells are attracted to, and retained in, the bone marrow by the action of locally generated SDF-1 on CXCR4 expressed by such cells (see e.g. Lapidot et al., 2005). The stem cells used in transplantation can be mobilised from donors (allogeneic transplantation) or patients (autologous transplantation) after 4 or 5 days treatment with G-CSF. G-CSF is used in approximately 70 percent of the haematopoietic stem cell transplantations (the rest being bone marrow and umbilical cord transplants, Copelan, 2006) and acts by reducing the expression of CXCR4 in stem cells and reducing marrow SDF-1 levels (Levesque et al., 2003). Success in such treatments is based on the success of re-engraftment of the isolated stem cells. Should insufficient stem cells be isolated (<5×10⁶/kg) then the re-engraftment is unlikely to be successful and the patient will not be treated. Multiple days of treatment with G-CSF may only result in sufficient yield in approximately 50% of cases. The CXCR4 antagonist Mozobil is now used to increase the efficiency of mobilisation, resulting in an approximate success rate of 90%. A single administration of CXCR4 antagonist, with a mobilisation delay of only a few hours, we predict will generate sufficient stem cells for effective transplantation (Devine et al., 2008). Such stem cells are we expect to show increased re-engraftment efficiency as they will not have had the expression of this receptor reduced by G-CSF treatment.

Non-Haematopoietic Stem and Progenitor Cell Mobilisation

An increase in plasma SDF-1 has been seen in a variety of models including heart infarction (Kucia et al., 2004; Wojakowski et al., 2004), stroke (Kucia et al., 2006), liver damage (Hatch et al., 2002), kidney damage, (Togel et al., 2005), pancreatic damage (Hess et al., 2003), bone fractures (Sata et al., 2005) and lung damage (Gomperts et al., 2006). It is hypothesised that the increase in SDF-1 is caused by the tissue damage and that gradients of this cytokine act to attract the relevant stem cells to the site of injury. This suggests a practical application of stem cell therapeutics for a wide range of injuries, all of which are regulated by the CXCR4/SDF-1 pathway. Interestingly Pitchford et al (2009) showed that different growth factors (VEGF, GCSF) administered with CXCR4 antagonists resulted in the mobilisation of different populations of stem cells, suggesting that appropriate combinations of factors could be used to isolate stem cells for the repair of specific tissues.

HIV and HIV Associated Pain

There is a known relationship between CCR5 and HIV (Alkhatib et al., 1996). The CXCR4 and CCR5 receptors act as entry cofactors for HIV infection. In brief, binding of the HIV gp120 protein to CD4 on the surface of CD4+ lymphocytes or macrophages exposes a domain in the gp120 protein which then also binds to the CCR5 or CXCR4 receptor, prior to viral insertion into the plasma membrane. CXCR4 antagonists have been shown to reduce the infectivity of X4 strains of the virus (Fransen et al., 2008), thus suggesting that the use of CXR4 antagonists would be effective treatments of HIV infection, especially in combination with CCR5 antagonists such as Maraviroc. The X4 strain of HIV is the most pathogenic, and these strains tend to predominate in the later stages of infection when neuropathic pain becomes an increasing problem for patients. Painful peripheral neuropathy affects approximately 50% of HIV patients. The HIV gp120 protein binds to CXCR4 and/or CCR5 which are expressed on neuronal and glial cells (Pardo et al, 2001; Oh et al., 2001), causing peripheral axonal damage (Melli et al, 2006) and initiating a cytokine-driven neurotoxic cascade involving glia and immune cells (Herzberg and Sagen, 2001; Milligan et al, 2000, 2001). The highly active anti-retroviral therapy (HAART) can also cause painful neuropathy (Dalakas et al, 2001), but this is predicted to become less common as improved therapies are used.

Therefore we expect CXCR4 antagonists to show both anti-viral, cognition enhancing and neuropathic pain relieving properties, and could be administered with other anti-(retro)viral therapies as well as analgesics such as amitryptiline, duloxetine and opiates.

Pain and Inflammation

Since the penetration of the blood brain barrier by leukocytes and monocytes is also influenced by the CXCR4 receptor, forms of brain inflammation and neurodegeneration (Bachis et al., J. Neuroscience, 2006, 26, 6771) whether virally induced or not, we expect to be amenable to therapy by CXCR4 antagonists (Kohler et al., 2008; McAndless et al., 2008). Similarly the expression of CXCR4 on primary sensory neurons suggests that antagonists of this receptor could act as analgesics in the control of pain (Oh et al., J Neurosci. 2001 21, 5027-35). In addition the potent chemotactic action of SDF-1 on inflammatory cells (Gouwy et al., Eur J Immunol. 2011 41, 963-73), suggests that CXCR4 antagonists could serve as anti-inflammatory therapeutics.

Retinal Neo-Vascularisation

Retinal neo-vascularisation is a major cause of blindness in patients with diabetes and age related macular degeneration. The SDF-1/CXCR4 axis is strongly implicated in ocular neo-vascularisation and has been suggested as a target for treating diabetic retinopathy. Blockade of the CXCR4 receptor prevents the recruitment of endothelial progenitor cells, essential for the formation of the new microvessels which are part of the pathology of diabetic retinopathy (Lima e Silva et al., 2009). We expect the effects of CXCR4 antagonists to be additive with those of VEGF antibodies such as avastin. Thus we expect topical or intravitreal administration of CXCR4 antagonist to be an effective treatment of retinal degeneration with diabetes and ageing.

Cancer and Cancer Metastasis

Several types of cancers (including non-small cell lung, breast and neuroblastoma) express CXCR4, and SDF-1 is highly expressed in internal organs that represent the primary metastatic destinations of the corresponding cancer cells (for review see Ben Baruch, 2008). CXCR4 and SDF-1 are also implicated in the maintenance of cancer stem cells (Wang et al., 2006; Croker and Allan, 2008) and in the recurrence of tumours after radiation therapy. The role of the SDF-1/CXCR4 axis in cancer and cancer stem cells metastasis is discussed in Gelmini S et al., 2008. Blockade of CXCR4 prevented both the vasculogenesis and recurrence of glioblastoma multiforme tumours (Kioi et al., 2010), after radiation treatment. This ability to inhibit tumour derived vasculogenesis leads us to expect that CXCR4 antagonists will be effective when dosed with other anti-angiogenic agents including those that inhibit VEGF (e.g. avastin and aflibercept) and inhibitors of VEGF and PDGFreceptors such as cediranib, sunitinib, sorafenib, pazopanib, tivozanib vatalanib, vandertanib, brivanib, dovitinib, motesanib, telatinib and axitinib (Bhargava and Robinson Curr Oncol Rep (2011) 13:103-111). Other anti-angiogenic agents for use in conjunction with CXCR4 antagonists include those which inhibit EGF, angiopioetins, MMP-9, TNF, bFGF, CXCL8, HGF and TF (Nozawa et al., Proc Natl Acad Sci USA. 103, 12493-12498, 2006; Murdoch et al., Nature Reviews Cancer 8, 618-631 2008). Therefore we expect CXCR4 antagonists to be useful in the prevention of metastasis, and in anti-angiogenic treatment, as well as in cancer stem cell protection and maintenance, and in the sensitization of tumours to radiotherapy.

BRIEF DESCRIPTION OF THE INVENTION

This invention makes available a class of compounds which are antagonists of the CXCR4 receptor, and their use in indications which respond to the antagonism of the CXCR4 receptor such as those mentioned above.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing the effect of Example 30 in the CXCR4-tropic HIV-1 attachment assay.

FIG. 2 is a graph showing the effect of Example 30 in the HIV anti-viral assay.

FIG. 3 is a bar graph showing circulating white blood cells (WBC) 1 hour after treatment with Example 30 compared to a vehicle control group.

FIG. 4 is a bar graph showing hematopoietic progenitors following treatment with Example 30 and/or G-CSF.

DETAILED DESCRIPTION OF THE INVENTION

According to the present invention there is provided a compound of formula (I) or a pharmaceutically acceptable salt thereof:

wherein: R¹ is selected from hydrogen, C₁₋₄-alkyl, cyano, —COR³, —CONR³R⁴ and heteroaryl, wherein

-   -   (a) said heteroaryl is optionally substituted with one more         substituents independently selected from halogen, hydroxy,         cyano, nitro, C₁₋₆-alkyl, C₃₋₅-cycloalkyl, C₁₋₄-alkoxy,         fluoro-C₁₋₆-alkyl, fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl,         fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl, C₆₋₁₀-aryl, heteroaryl,         —NR^(5A)R^(5B), —C₁₋₄-alkyl-NR^(5A)R^(5B), —NR⁴C(O)O—C₁₋₄-alkyl,         —NR⁴C(O)—C₁₋₄-alkyl, —NR⁴C(O)O-fluoro-C₁₋₄-alkyl,         —NR⁴C(O)-fluoro-C₁₋₄-alkyl, —NR⁴C(O)NR^(5A)R^(5B),         —C(O)NR^(5A)R^(5B), —C(O)R⁴, —C(O)OR⁴, —NR⁴S(O)₂—C₁₋₄-alkyl and         —NR⁴S(O)₂-fluoro-C₁₋₄-alkyl, and     -   (b) said C₁₋₄-alkyl is optionally substituted with one or more         substituents independently selected from fluorine, hydroxyl and         C₁₋₄-alkoxy;         X is selected from radicals of formulae (A)-(F) inclusive, any         of which being optionally substituted with one more substituents         independently selected from halogen, cyano, nitro, C₁₋₄-alkyl,         C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl and fluoro-C₁₋₄-alkoxy, wherein         the bond marked * is attached to R¹ and the bond marked ** is         attached to Y:

Y is selected from radicals of formulae (H), (J), (K), (L) and (M) any of which is optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, a divalent C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl, a divalent fluoro-C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine and fluoro-C₁₋₄-alkoxy, wherein the bond marked * is attached to X and the bond marked ** is attached to R²:

and n and m are each independently 1 or 2, and R²⁰ is hydrogen, or C₁₋₄-alkyl; R² is selected from radicals of formulae (N)-(S) inclusive, any of which is optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl and fluoro-C₁₋₄-alkoxy, wherein the bond marked * is attached to Y:

and o and p are each independently 1 or 2, and W is O or NR⁹; R³ is selected from hydrogen, C₁₋₆-alkyl, C₃₋₅-cycloalkyl, C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl, heterocyclyl-C₁₋₄-alkyl, C₆₋₁₀-aryl, heteroaryl, C₆₋₁₀-aryl-C₁₋₄-alkyl and heteroaryl-C₁₋₄-alkyl, wherein

-   -   (i) said C₁₋₆-alkyl, C₃₋₅-cycloalkyl, heterocyclyl or the         heterocyclyl part of said heterocyclyl-C₁₋₄-alkyl, or the         C₁₋₆-alkyl part of said heterocyclyl-C₁₋₄-alkyl,         C₆₋₁₀-aryl-C₁₋₄-alkyl or heteroaryl-C₁₋₄-alkyl, is optionally         substituted with one or more substituents independently selected         from fluorine, hydroxy, C₁₋₄-alkoxy and —NR^(5A)R^(5B), and     -   (ii) said C₆₋₁₀-aryl or heteroaryl, or the C₆₋₁₀-aryl part of         said C₆₋₁₀-aryl-C₁₋₄-alkyl or the heteroaryl part of said         heteroaryl-C₁₋₄-alkyl, is optionally substituted with one more         substituents independently selected from halogen, hydroxy,         cyano, nitro, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl,         fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl,         fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl, —NR^(5A)R^(5B),         —C₁₋₄-alkyl-NR^(5A)R^(5B), —NR⁴C(O)O—C₁₋₄alkyl,         —NR⁴C(O)—C₁₋₄alkyl, —NR⁴C(O)O-fluoro-C₁₋₄alkyl,         —NR⁴C(O)-fluoro-C₁₋₄alkyl, —NR⁴C(O)NR^(5A)R^(5B),         —C(O)NR^(5A)R^(5B), —C(O)R⁴, —C(O)OR⁴, —NR⁴S(O)₂—C₁₋₄alkyl and         —NR⁴S(O)₂-fluoro-C₁₋₄alkyl;         R⁴, R^(5A) and R^(5B) are each independently selected from         hydrogen, C₁₋₄-alkyl and fluoro-C₁₋₄-alkyl,         or         R^(5A) and R^(5B) together with the nitrogen atom to which they         are bound, form a 4- to 7-membered saturated heterocyclic ring         or a heteroaryl ring, said ring being optionally substituted         with one or more substituents independently selected from         fluorine, hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl and         C₁₋₄-alkoxy,         or         R³ and R⁴, together with the nitrogen atom to which they are         bound, form a 4- to 7-membered saturated heterocyclic ring or a         heteroaryl ring, said ring being optionally substituted with one         or more substituents independently selected from fluorine,         hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl and C₁₋₄-alkoxy; and         R⁶ is selected from C₁₋₆-alkyl, C₃₋₅-cycloalkyl,         C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl,         heterocyclyl-C₁₋₄-alkyl, C₆₋₁₀-aryl-C₁₋₄-alkyl and C₆₋₁₀-aryl,         wherein     -   (iii) said C₁₋₆-alkyl, C₃₋₅-cycloalkyl, heterocyclyl, or the         C₁₋₆-alkyl part of said heterocyclyl-C₁₋₄-alkyl or         C₆₋₁₀-aryl-C₁₋₄-alkyl, or the heterocyclyl part of said         heterocyclyl-C₁₋₄-alkyl is optionally substituted with one or         more substituents independently selected from fluorine, hydroxyl         and C₁₋₄-alkoxy, and     -   (iv) said C₆₋₁₀-aryl or the C₆₋₁₀-aryl part of said         C₆₋₁₀-aryl-C₁₋₄-alkyl is optionally substituted with one more         substituents independently selected from halogen, hydroxy,         cyano, nitro, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl,         fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl and         fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl;         R⁷ is selected from C₁₋₆-alkyl, C₃₋₅-cycloalkyl,         C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl,         heterocyclyl-C₁₋₄-alkyl, C₆₋₁₀-aryl-C₁₋₄-alkyl and C₆₋₁₀-aryl         and —NR^(10A)R^(10B), wherein     -   (v) said C₁₋₆-alkyl, C₃₋₅-cycloalkyl, heterocyclyl, or the         C₁₋₆-alkyl part of said heterocyclyl-C₁₋₄-alkyl or         C₆₋₁₀-aryl-C₁₋₄-alkyl, or the heterocyclyl part of said         heterocyclyl-C₁₋₄-alkyl is optionally substituted with one or         more substituents independently selected from fluorine, hydroxyl         and C₁₋₄-alkoxy, and     -   (vi) said C₆₋₁₀-aryl or the C₆₋₁₀-aryl part of said         C₆₋₁₀-aryl-C₁₋₄-alkyl is optionally substituted with one more         substituents independently selected from halogen, hydroxy,         cyano, nitro, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl,         fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl and         fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl;         R^(8A), R^(8B) and R⁹ are each independently selected from         hydrogen, C₃₋₅-cycloalkyl, C₁₋₆-alkyl, and C₆₋₁₀-aryl-C₁₋₄-alkyl         wherein any alkyl residue or cycloalkyl or C₆₋₁₀-aryl ring         system is optionally substituted with one or more substituents         independently selected from halogen, hydroxyl and C₁₋₄-alkoxy,         or         R^(8A) and R^(8B), together with the nitrogen atom to which they         are bound, form a 4- to 7-membered saturated heterocyclic ring         which is optionally fused to a C₆₋₁₀-aryl or heteroaryl ring         system, the 4- to 7-membered saturated heterocyclic ring or the         C₆₋₁₀-aryl or heteroaryl ring systems being optionally         substituted with one or more substituents independently selected         from halogen, hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl and         C₁₋₄-alkoxy;         and         R^(10A) and R^(10B) are each independently selected from         hydrogen and C₁₋₆-alkyl, wherein said C₁₋₆-alkyl is optionally         substituted with one or more substituents independently selected         from fluorine, hydroxyl and C₁₋₄-alkoxy,         or         R^(10A) and R^(10B), together with the nitrogen atom to which         they are bound, form a 4- to 7-membered saturated heterocyclic         ring or a heteroaryl ring, optionally substituted with one or         more substituents independently selected from fluorine,         hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl and C₁₋₄-alkoxy;         provided that         when Y is a piperazine of formula (H) wherein n=1, then R² is         not piperidine wherein p=1, and o=2; and         when Y is a piperazine of formula (H) wherein n=1 then R² is not         an alkyl amino of formula (S).

Compounds of formula (I) above may be prepared in the form of salts, especially pharmaceutically acceptable salts, N-oxides, hydrates, solvates and polymorphic forms thereof. Any claim to a compound herein, or reference herein to “compounds of the invention”, “compounds with which the invention is concerned”, “compounds of formula (I)” and the like, includes salts, N-oxides, hydrates, solvates and polymorphs of such compounds;

Although the above definition potentially includes molecules of high molecular weight, it is preferable, in line with general principles of medicinal chemistry practice, that the compounds with which this invention is concerned should have molecular weights of no more than 600.

The compounds of the invention are antagonists of the CXCR4 receptor. Therefore, in another broad aspect the invention provides the use of a compound of the invention in the treatment of, or in the preparation of a composition for treatment of, diseases or conditions responsive to the reduction of CXCR4 mediated activity.

Examples of diseases or conditions which are responsive to the reduction of CXCR4 mediated activity include cancer including cancers of the haematopoietic system such as multiple myeloma and non-Hodgkin's lymphoma, non-small cell lung, breast and neuroblastoma, cancer metastasis, HIV/AIDS, neuropathy, HIV related neuropathy, pain, inflammation, brain inflammation, neurodegeration, cognative degeneration, diabetic retinopathy, age related macular degeneration, retinal neo-vascularisation, and viral infections.

The compounds with which the invention is concerned may be used for the reduction of CXCR4 mediated activity, ex vivo or in vivo.

In one aspect of the invention, the compounds of the invention may be used in the preparation of a composition for the treatment of cancer including cancers of the haematopoietic system such as multiple myeloma and non-Hodgkin's lymphoma, non-small cell lung, breast and neuroblastoma, cancer metastasis, HIV/AIDS, neuropathy, HIV related neuropathy, pain, inflammation, brain inflammation, neurodegeration, cognative degeneration, diabetic retinopathy, age related macular degeneration, retinal neo-vascularisation, and viral infections.

In another aspect, the invention provides a method for the treatment of the foregoing disease types, which comprises administering to a subject suffering such disease an effective amount of a compound of the invention.

In another aspect, the compounds of the invention may be used for stem cell apheresis including haematopoietic stem cell mobilisation and non-haematopoietic stem and progenitor cell mobilization. Apheresis in its broadest meaning is a procedure in which blood is drawn and separated into its components, for example by dialysis; some components are retained and the rest are used for further medical procedures such as being returned to the donor or another subject by transfusion. Thus, apheresis may be applied, for example, to harvest stem cells from plasma for subsequent use in stem cell transplantation. A further example of a therapeutic application of stem cell apheresis is in reducing leukopenia which would otherwise be a consequence of chemotherapy or radiotherapy. Stem cells are damaged during chemo- or radiotherapy, and stem cell apheresis may be used to harvest stem cells from the body prior to such treatment, and then returned undamaged to the body once the radio- or chemotherapy is finished.

In another aspect, the apheresis procedure may be implemented prior to treatment of a subject by chemotherapy or radiotherapy, in order to reduce chemotherapy- or radiotherapy-induced leukopenia.

In another aspect, the compounds of the invention may be administered as an adjunct to chemotherapy or radiotherapy to sensitize tumours to such chemotherapy or radiotherapy.

In another aspect, the compounds of the invention may be used for inhibition of neo-vascularisation, angiogenesis, or vasculogenesis.

In another aspect of the invention, there is provided a pharmaceutical composition comprising a compound of the invention together with one or more pharmaceutically acceptable carriers and/or excipients.

In another aspect, there is provided a pharmaceutical composition comprising a compound of the invention together with one or more anti-angiogenic agents. In one embodiment the anti-angiogenic agent is an inhibitor of the VEGF receptor. In another embodiment the anti-angiogenic agent is an inhibitor of the PDGF receptor. In another embodiment the anti-angiogenic agent is selected from cediranib, sunitinib, sorafenib, pazopanib, tivozanib vatalanib, vandertanib, brivanib, dovitinib, motesanib, telatinib and axitinib.

The compounds of the invention may be administered in a variety of dosage forms. Thus, they can be administered orally, for example as tablets, capsules, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules. The compounds can be administered in a sublingual formulation, for example a buccal formulation. The compounds of the invention may also be administered parenterally, whether subcutaneously, intravenously, intramuscularly, intrasternally, transdermally, by inhalation, intranasally, or by infusion techniques. The compounds may also be administered as suppositories. Thus, the compounds of the invention are administered orally, or by inhalation, or intranasally, but preferably the compounds of the invention are administered orally and more preferably, the compounds of the invention are administered as a tablet or capsule. In the latter connection, administration of the compounds in a hard gelatine capsule form, or in one of the many sustained release formulations known in the art will often be preferred.

The compounds of the invention are typically formulated for administration with a pharmaceutically acceptable carrier or diluent. For example, solid oral forms may contain, together with the active compound, diluents, e.g. lactose, dextrose, saccharose, cellulose, corn starch or potato starch; lubricants, e.g. silica, talc, stearic acid, magnesium or calcium stearate, and/or polyethylene glycols; binding agents; e.g. starches, arabic gums, gelatin, methylcellulose, carboxymethylcellulose or polyvinyl pyrrolidone; disaggregating agents, e.g. starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuffs; sweeteners; wetting agents, such as lecithin, polysorbates, laurylsulphates; and, in general, non toxic and pharmacologically inactive substances used in pharmaceutical formulations. Such pharmaceutical preparations may be manufactured in known manner, for example, by means of mixing, granulating, tableting, sugar coating, or film coating processes.

Liquid dispersions for oral administration may be syrups, emulsions and suspensions. The syrups may contain as carriers, for example, saccharose or saccharose with glycerine and/or mannitol and/or sorbitol. Suspensions and emulsions may contain as carrier, for example a natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose, or polyvinyl alcohol. The suspension or solutions for intramuscular injections may contain, together with the active compound, a pharmaceutically acceptable carrier, e.g. sterile water, olive oil, ethyl oleate, glycols, e.g. propylene glycol, and if desired, a suitable amount of lidocaine hydrochloride.

Since the compounds of the invention are preferably administered orally, the present invention further provides a pharmaceutical composition containing a compound of the invention or a pharmaceutically acceptable salt thereof, as defined above, and a pharmaceutically acceptable carrier in the form of a capsule or tablet.

Solutions for injection or infusion may contain as carrier, for example, sterile water or preferably they may be in the form of sterile, aqueous, isotonic saline solutions.

It will be understood that the specific dose level for any particular patient will depend upon a variety of factors including the activity of the specific compound employed, the age, body weight, general health, sex, diet, time of administration, route of administration, rate of excretion, drug combination and the severity of the particular disease undergoing treatment. Optimum dose levels and frequency of dosing will be determined by clinical trial, as is required in the art. However, it is expected that a typical dose will be in the range from about 0.001 to 50 mg per kg of body weight.

Terminology

The following definitions shall apply throughout the specification and the appended claims, unless otherwise stated or indicated.

Where elements present in the compounds of the invention exist as different isotopes, for example carbon (C¹³ and C¹⁴) nitrogen (N¹⁴ and N¹⁵) and hydrogen (H¹ and H² ie deuterium), such compounds form part of the invention irrespective of the isotopic form of the element present in the compound. In particular, where a compound of the invention has a hydrogen atom in any position, that hydrogen may be replaced by deuterium. It is known in the art that deuterium substitution can increase the metabolic stability of biologically active molecules.

The term “halogen” denotes a fluoro, chloro, bromo or iodo substituent. In a presently preferred embodiment halogen is fluoro or chloro.

The term “C_(a-b)-alkyl” wherein a and b are integers denotes a straight or branched alkyl group having from a to b carbon atoms. For example “C₁₋₄-alkyl” includes methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, sec-butyl and tert-butyl and “C₁₋₆-alkyl” includes the foregoing and straight- and branched-chain pentyl and hexyl.

The term “fluoro-C_(a-b)-alkyl” wherein a and b are integers denotes a straight or branched C_(a-b)-alkyl group substituted by one or more fluorine atoms. For example fluoro-C₁₋₄-alkyl includes fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl.

The term “C_(a-b)-alkoxy” wherein a and b are integers refers to a straight or branched C_(a-b)-alkyl group which is attached to the remainder of the molecule through an oxygen atom. For example C₁₋₄-alkoxy includes methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy.

The term “fluoro-C_(a-b)-alkoxy” wherein a and b are integers denotes a fluoro-C_(a-b)-alkyl group which is attached to the remainder of the molecule through an oxygen atom. For example “fluoro-C₁₋₄-alkoxy” groups include trifluoromethoxy and 2,2,2-trifluoroethoxy.

The term “C_(a-b)-alkoxy-C_(c-d)-alkyl” wherein a, b, c and d are integers denotes a straight or branched alkoxy group having from a to b carbon atoms connected to a straight or branched alkyl group having from c to d carbon atoms. For example “C₁₋₄-alkoxy-C₁₋₄-alkyl” includes methoxymethyl, methoxyethyl, ethoxyethyl, iso-propoxyethyl, n-butoxyethyl and tert-butoxyethyl. In an alternative example “C₁₋₂-alkoxy-C₁₋₄-alkyl” includes methoxymethyl, methoxyethyl, and ethoxyethyl.

The term fluoro-C_(a-b)-alkoxy-C_(c-d)-alkyl wherein a, b, c and d are integers denotes a C_(a-b)-alkoxy-C_(c-d)-alkyl group substituted by one or more fluorine atoms. For example “fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl” includes trifluoromethoxymethyl and trifluoromethoxyethyl.

The term “C_(a-b)-cycloalkyl” wherein a and b are integers denotes a saturated monocyclic hydrocarbon ring having from a to b carbon atoms. For examples “C₃₋₅-cycloalkyl” includes cyclopropyl, cyclobutyl and cyclopentyl. The term “C₃₋₅-cycloalkyl” also includes a cyclopropyl, cyclobutyl or cyclopentyl ring system which is fused to a C₆₋₁₀-aryl group such as phenyl.

The term “C_(a-b)-cycloalkyl-C_(c-d)-alkyl” wherein a, b, c and d are integers denotes a saturated monocyclic hydrocarbon ring having from a to b carbon atoms connected to a straight or branched alkyl group having from c to d carbon atoms. For example “C₃₋₅-cycloalkyl-C₁₋₄-alkyl” includes cyclopropylmethyl and cyclobutylmethyl.

Unless otherwise particularised, the term “heterocyclyl” or “heterocyclic ring” denotes a saturated, monocyclic ring having from 4 to 7 ring atoms with at least one heteroatom such as O, N, or S, and the remaining ring atoms are carbon. Examples of heterocyclic rings include piperidinyl, tetrahydropyranyl, tetrahydrofuranyl, oxetanyl, azetidinyl, pyrrolidinyl, morpholinyl, thiomorpholinyl, dioxanyl, piperazinyl and homopiperazinyl. When present, the sulfur atom may be in an oxidized form (i.e., S═O or O═S═O). Exemplary heterocyclic groups containing sulfur in oxidized form are 1,1-dioxido-thiomorpholinyl and 1,1-dioxido-isothiazolidinyl. The term “heterocyclyl” or “heterocyclic ring” also includes a ring system in which the “heterocyclyl” or “heterocyclic ring” is fused to a C₆₋₁₀-aryl ring system, such as phenyl.

Unless otherwise particularised the term “heterocyclyl-C_(a-b)-alkyl” wherein a and b are integers denotes a heterocyclic ring as defined above that is directly attached to a straight or branched C_(a-b)-alkyl group via a carbon or nitrogen atom of said ring. For example “heterocyclyl-C₁₋₄-alkyl” groups include piperidin-1-ylmethyl, piperidin-4-ylmethyl and morpholin-4-ylmethyl.

Unless otherwise particularised the term “heteroaryl” denotes a monocyclic or fused bicyclic heteroaromatic ring system comprising 5 to 10 ring atoms in which one or more of the ring atoms are other than carbon, such as nitrogen, sulphur or oxygen. Only one ring need to be aromatic and said heteroaryl moiety can be linked to the remainder of the molecule via a carbon or nitrogen atom in any ring. Examples of heteroaryl groups include furyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl, imidazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl, tetrazolyl, quinazolinyl, indolyl, indolinyl, isoindolyl, isoindolinyl, pyrazolyl, pyridazinyl, pyrazinyl, quinolinyl, quinoxalinyl, oxadiazolyl, thiadiazolyl, benzofuranyl, 2,3-dihydrobenzofuranyl, 1,3-benzodioxolyl, 1,4-benzodioxinyl, benzothiazolyl, benzimidazolyl, azabenzimidazole, benzotriazolyl and chromanyl.

Unless otherwise particularised the term “C_(a-b)-aryl” wherein a and b are integers denotes a monocyclic or fused bicyclic hydrocarbon ring system comprising a to b ring atoms and wherein at least one ring is an aromatic ring. For example “C₆₋₁₀-aryl” groups include phenyl, indenyl, 2,3-dihydroindenyl (indanyl), 1-naphthyl, 2-naphthyl or 1,2,3,4-tetrahydronaphthyl.

Unless otherwise particularised the term “C_(a-b)-aryl-C_(c-d)-alkyl” wherein a, b, c and d are integers refers to a C_(a-b)-aryl group that is directly linked to a straight or branched C_(c-d)-alkyl group. For example “C₆₋₁₀-aryl-C₁₋₄-alkyl” groups include phenylmethyl (i.e., benzyl) and phenylethyl.

Unless otherwise particularised the term “heteroaryl-C_(a-b)-alkyl” wherein a and b are integers denotes a heteroaryl ring as defined above that is directly linked to a straight or branched C_(a-b)-alkyl group via a carbon or nitrogen atom of said ring. For examples “heteroaryl-C₁₋₄-alkyl” groups include 2-(pyridin-2-yl)-ethyl and 1,2,4-oxadiazol-5-ylmethyl.

Compounds of the invention may exist in one or more geometrical, optical, enantiomeric, diastereomeric and tautomeric forms, including but not limited to cis- and trans-forms, E- and Z-forms, R-, S- and meso-forms, keto-, and enol-forms. Unless otherwise stated a reference to a particular compound includes all such isomeric forms, including racemic and other mixtures thereof. Where appropriate such isomers can be separated from their mixtures by the application or adaptation of known methods (e.g. chromatographic techniques and recrystallisation techniques). Where appropriate such isomers may be prepared by the application of adaptation of known methods (e.g. asymmetric synthesis).

As used herein the term “salt” includes base addition, acid addition and ammonium salts. As briefly mentioned above compounds of the invention which are acidic can form salts, including pharmaceutically acceptable salts, with bases such as alkali metal hydroxides, e.g. sodium and potassium hydroxides; alkaline earth metal hydroxides e.g. calcium, barium and magnesium hydroxides; with organic bases e.g. N-methyl-D-glucamine, choline tris(hydroxymethyl)amino-methane, L-arginine, L-lysine, N-ethyl piperidine, dibenzylamine and the like. Those compounds of the invention which are basic can form salts, including pharmaceutically acceptable salts with inorganic acids, e.g. with hydrohalic acids such as hydrochloric or hydrobromic acids, sulphuric acid, nitric acid or phosphoric acid and the like, and with organic acids e.g. with acetic, trifluoroacetic, tartaric, succinic, fumaric, maleic, malic, salicylic, citric, methanesulphonic, p-toluenesulphonic, benzoic, benzenesulfonic, glutamic, lactic, and mandelic acids and the like. Those compounds (I) which have a basic nitrogen can also form quaternary ammonium salts with a pharmaceutically acceptable counter-ion such as chloride, bromide, acetate, formate, p-toluenesulfonate, succinate, hemi-succinate, naphthalene-bis sulfonate, methanesulfonate, trifluoroacetate, xinafoate, and the like. For a review on salts, see Handbook of Pharmaceutical Salts: Properties, Selection, and Use by Stahl and Wermuth (Wiley-VCH, Weinheim, Germany, 2002).

It is expected that compounds of the invention may be prepared in the form of hydrates, and solvates. Any reference herein, including the claims herein, to “compounds with which the invention is concerned” or “compounds of the invention” or “the present compounds”, and the like, includes reference to salts, hydrates, and solvates of such compounds. The term ‘solvate’ is used herein to describe a molecular complex comprising the compound of the invention and a stoichiometric amount of one or more pharmaceutically acceptable solvent molecules, for example, ethanol. The term ‘hydrate’ is employed when said solvent is water.

Individual compounds of the invention may exist in an amorphous form and/or several polymorphic forms and may be obtained in different crystal habits. Any reference herein, including the claims herein, to “compounds with which the invention is concerned” or “compounds of the invention” or “the present compounds”, and the like, includes reference to the compounds irrespective of amorphous or polymorphic form.

Some compounds of the invention, having a nitrogen atom in an aromatic ring, may form N-oxides, and the invention includes compounds of the invention in their N-oxide form.

In the compounds of the invention, in any compatible combination, and bearing in mind that the compounds preferably have a molecular weight of less than 600:

The Group R¹

As defined above, R¹ is selected from hydrogen, C₁₋₄-alky such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, cyano, —COR³, —CONR³R⁴ and heteroaryl such as furyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl, imidazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl, tetrazolyl, quinazolinyl, indolyl, indolinyl, isoindolyl, isoindolinyl, pyrazolyl, pyridazinyl, pyrazinyl, quinolinyl, quinoxalinyl, oxadiazolyl, thiadiazolyl, benzofuranyl, 2,3-dihydrobenzofuranyl, 1,3-benzodioxolyl, 1,4-benzodioxinyl, benzothiazolyl, benzimidazolyl, benzotriazolyl and chromanyl, wherein

-   -   (a) said heteroaryl is optionally substituted with one more         substituents independently selected from halogen such as fluoro,         chloro, bromo, hydroxy, cyano, nitro, C₁₋₆-alkyl such as methyl,         ethyl, n- or iso-propyl, n-butyl, isobutyl, sec-butyl and         t-butyl, and straight or branched pentyl or hexyl,         C₃₋₅-cycloalkyl such as cyclopropyl, cyclobutyl and cyclopentyl,         C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy,         n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy,         fluoro-C₁₋₆-alkyl such as mono-, di- or tri-fluoromethyl,         2-fluoroethyl and 2,2,2-trifluoroethyl, fluoro-C₁₋₄-alkoxy such         as trifluoromethoxy and 2,2,2-trifluoroethoxy,         C₁₋₄-alkoxy-C₁₋₄-alkyl such as methoxymethyl, methoxyethyl,         ethoxyethyl, isopropoxyethyl, n-butoxyethyl and         tert-butoxyethyl, fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl such as         trifluoromethoxymethyl and trifluoromethoxyethyl, C₆₋₁₀-aryl         such as phenyl, indenyl, 2,3-dihydroindenyl (indanyl),         1-naphthyl, 2-naphthyl or 1,2,3,4-tetrahydronaphthyl, heteroaryl         such as such as furyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl,         imidazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl,         tetrazolyl, quinazolinyl, indolyl, indolinyl, isoindolyl,         isoindolinyl, pyrazolyl, pyridazinyl, pyrazinyl, quinolinyl,         quinoxalinyl, oxadiazolyl, thiadiazolyl, benzofuranyl,         2,3-dihydrobenzofuranyl, 1,3-benzodioxolyl, 1,4-benzodioxinyl,         benzothiazolyl, benzimidazolyl, benzotriazolyl and chromanyl,         —NR^(5A)R^(5B), —C₁₋₄-alkyl-NR^(5A)R^(5B), —NR⁴C(O)O—C₁₋₄-alkyl,         —NR⁴C(O)—C₁₋₄-alkyl, —NR⁴C(O)O-fluoro-C₁₋₄-alkyl,         —NR⁴C(O)-fluoro-C₁₋₄-alkyl, —NR⁴C(O)NR^(5A)R^(5B),         —C(O)NR^(5A)R^(5B), —C(O)R⁴, —C(O)OR⁴, —NR⁴S(O)₂—C₁₋₄-alkyl and         —NR⁴S(O)₂-fluoro-C₁₋₄-alkyl, and     -   (b) said C₁₋₄-alkyl is optionally substituted with one or more         substituents independently selected from fluorine, hydroxyl and         C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, iso-propoxy,         n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy;         The Group X

As defined above, X is selected from radicals of formulae (A), (B), (C), (D), (E), or (F) inclusive, any of which being optionally substituted with one more substituents independently selected from halogen such as fluoro, chloro, bromo, cyano, nitro, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy, fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl, and fluoro-C₁₋₄-alkoxy such as trifluoromethoxy and 2,2,2-trifluoroethoxy,

The Group Y

As defined above, Y is selected from radicals of formulae (H) such as piperazine and homopiperazine, (J) such as amino-piperidine and amino-homopiperidine, (K) such as amino-piperidine and amino-homopiperidine, (L) such as 1,2-diaminoethane and 1,3-diamino propane, and (M) such as oxy-piperidine, any of which is optionally substituted with one more substituents independently selected from, fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl a divalent C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine, examples include —CH₂—, —CH₂CH₂— and —CH₂CH₂CH₂—, C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy, fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl, a divalent fluoro-C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine, examples include —CH₂—, —CH₂CH₂— and —CH₂CH₂CH₂— wherein one or more hydrogens are replaced by fluorine, and fluoro-C₁₋₄-alkoxy such as trifluoromethoxy and 2,2,2-trifluoroethoxy.

The Group R²

As defined above, R² is selected from radicals of formulae (N), (O), (P), (Q), (R), and (S) inclusive, any of which is optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy, fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl and fluoro-C₁₋₄-alkoxy such as trifluoromethoxy and 2,2,2-trifluoroethoxy,

The Group R³

As defined above, R³ is selected from hydrogen, C₁₋₆-alkyl such as methyl, ethyl, n- or iso-propyl, n-butyl, isobutyl, sec-butyl and tert-butyl, straight or branched pentyl and hexyl, C₃₋₅-cycloalkyl such as cyclopropyl, cyclobutyl and cyclopentyl, C₃₋₅-cycloalkyl-C₁₋₄-alkyl such as cyclopropylmethyl and cyclobutylmethyl, heterocyclyl such as piperidinyl, tetrahydropyranyl, tetrahydrofuranyl, oxetanyl, azetidinyl, pyrrolidinyl, morpholinyl, imidazolidinyl, thiomorpholinyl, dioxanyl, piperazinyl, homopiperazinyl, 1,1-dioxido-thiomorpholinyl and 1,1-dioxido-isothiazolidinyl, heterocyclyl-C₁₋₄-alkyl such as piperidin-1-ylmethyl, piperidin-4-ylmethyl and morpholin-4-ylmethyl, C₆₋₁₀-aryl such as phenyl, indenyl, 2,3-dihydroindenyl (indanyl), 1-naphthyl, 2-naphthyl or 1,2,3,4-tetrahydronaphthyl, C₆₋₁₀-aryl-C₁₋₄-alkyl such as phenylmethyl (i.e., benzyl) and phenylethyl, heteroaryl such as furyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl, imidazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl, tetrazolyl, quinazolinyl, indolyl, indolinyl, isoindolyl, isoindolinyl, pyrazolyl, pyridazinyl, pyrazinyl, quinolinyl, quinoxalinyl, oxadiazolyl, thiadiazolyl, benzofuranyl, 2,3-dihydrobenzofuranyl, 1,3-benzodioxolyl, 1,4-benzodioxinyl, benzothiazolyl, benzimidazolyl, benzotriazolyl and chromanyl, and heteroaryl-C₁₋₄-alkyl such as 2-(pyridin-2-yl)-ethyl and 1,2,4-oxadiazol-5-ylmethyl, wherein

-   -   (i) said C₁₋₆-alkyl, C₃₋₅-cycloalkyl, heterocyclyl or the         heterocyclyl part of said heterocyclyl-C₁₋₄-alkyl, or the         C₁₋₆-alkyl part of said heterocyclyl-C₁₋₄-alkyl,         C₆₋₁₀-aryl-C₁₋₄-alkyl or heteroaryl-C₁₋₄-alkyl, is optionally         substituted with one or more substituents independently selected         from fluorine, hydroxy, C₁₋₄-alkoxy such as methoxy, ethoxy,         n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and         tert-butoxy, and —NR^(5A)R^(5B), and     -   (ii) said C₆₋₁₀-aryl or heteroaryl, or the C₆₋₁₀-aryl part of         said C₆₋₁₀-aryl-C₁₋₄-alkyl or the heteroaryl part of said         heteroaryl-C₁₋₄-alkyl, is optionally substituted with one more         substituents independently selected from halogen such as fluoro,         chloro or bromo, hydroxy, cyano, nitro, C₁₋₄-alkyl- such as         methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl,         C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, iso-propoxy,         n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy,         fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl,         2-fluoroethyl and 2,2,2-trifluoroethyl, fluoro-C₁₋₄-alkoxy such         as trifluoromethoxy and 2,2,2-trifluoroethoxy,         C₁₋₄-alkoxy-C₁₋₄-alkyl such as methoxymethyl, methoxyethyl,         ethoxyethyl, iso-propoxyethyl, n-butoxyethyl and t-butoxyethyl,         fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl such as trifluoromethoxymethyl and         trifluoromethoxyethyl, —NR^(5A)R^(5B),         —C₁₋₄-alkyl-NR^(5A)R^(5B), —NR⁴C(O)O—C₁₋₄alkyl,         —NR⁴C(O)—C₁₋₄alkyl, —NR⁴C(O)O-fluoro-C₁₋₄alkyl,         —NR⁴C(O)-fluoro-C₁₋₄alkyl, —NR⁴C(O)NR^(5A)R^(5B),         —C(O)NR^(5A)R^(5B), —C(O)R⁴, —C(O)OR⁴, —NR⁴S(O)₂—C₁₋₄alkyl and         —NR⁴S(O)₂-fluoro-C₁₋₄alkyl;         The Groups R⁴, R^(5A) and R^(5B)

As defined above, R⁴, R^(5A) and R^(5B) are each independently selected from hydrogen, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, and fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl,

or

R³ and R⁴, together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring such as pyrrolidine, piperidine, homopiperidine, piperazine, homopiperazine and morpholine, or a heteroaryl ring such as pyrrole, imidazole, indole, isoindole, indazole, or purine, said ring being optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl, and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy Group R⁶

As defined above, R⁶ is selected from C₁₋₆-alkyl such as methyl, ethyl, n- or iso-propyl, n-butyl, isobutyl, sec-butyl and tert-butyl, and straight or branched pentyl and hexyl, C₃₋₅-cycloalkyl such as cyclopropyl, cyclobutyl and cyclopentyl, C₃₋₅-cycloalkyl-C₁₋₄-alkyl such as cyclopropylmethyl and cyclobutylmethyl, heterocyclyl such as piperidinyl, tetrahydropyranyl, tetrahydrofuranyl, oxetanyl, azetidinyl, pyrrolidinyl, morpholinyl, imidazolidinyl, thiomorpholinyl, dioxanyl, piperazinyl, homopiperazinyl 1,1-dioxido-thiomorpholinyl and 1,1-dioxido-isothiazolidinyl, heterocyclyl-C₁₋₄-alkyl such as piperidin-1-ylmethyl, piperidin-4-ylmethyl and morpholin-4-ylmethyl, C₆₋₁₀-aryl such as phenyl, indenyl, 2,3-dihydroindenyl (indanyl), 1-naphthyl, 2-naphthyl or 1,2,3,4-tetrahydronaphthyl, heteroaryl, and C₆₋₁₀-aryl-C₁₋₄-alkyl such as phenylmethyl (i.e., benzyl) and phenylethyl, wherein

-   -   (iii) said C₁₋₆-alkyl, C₃₋₅-cycloalkyl, heterocyclyl, or the         C₁₋₆-alkyl part of said heterocyclyl-C₁₋₄-alkyl or         C₆₋₁₀-aryl-C₁₋₄-alkyl, or the heterocyclyl part of said         heterocyclyl-C₁₋₄-alkyl is optionally substituted with one or         more substituents independently selected from fluorine, hydroxyl         and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, iso-propoxy,         n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy, and     -   (iv) said C₆₋₁₀-aryl or the C₆₋₁₀-aryl part of said         C₆₋₁₀-aryl-C₁₋₄-alkyl is optionally substituted with one more         substituents independently selected from halogen including         fluoro or chloro, hydroxy, cyano, nitro, C₁₋₄-alkyl such as         methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl,         C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy,         n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy,         fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl,         2-fluoroethyl and 2,2,2-trifluoroethyl, fluoro-C₁₋₄-alkoxy such         as trifluoromethoxy and 2,2,2-trifluoroethoxy,         C₁₋₄-alkoxy-C₁₋₄-alkyl such as methoxymethyl, methoxyethyl,         ethoxyethyl, isopropoxyethyl, n-butoxyethyl and t-butoxyethyl,         and fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl such as trifluoromethoxymethyl         and trifluoromethoxyethyl;         The Groups R^(8A), R^(8B) and R⁹

As defined above, R^(8A), R^(8B) and R⁹ are each independently selected from hydrogen, C₃₋₅-cycloalkyl such as cyclopropyl or cyclobutyl or cyclopentyl, C₆₋₁₀aryl-C₁₋₄alkyl such as phenyl methyl (benxyl) and C₁₋₆-alkyl such as methyl, ethyl, n- or iso-propyl, n-butyl, isobutyl, sec-butyl and t-butyl, and straight or branched pentyl and hexyl, wherein any alkyl residue is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy,

or

R^(8A) and R^(8B), together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring such as pyrrolidine, piperidine homopiperidine, piperazine, homopiperazine and morpholine, optionally substituted with one or more substituents independently selected from halogen such as fluoro or chloro, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, fluoro-C₁₋₄-alkyl and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy or the 4-7 membered saturated heterocyclic ring is optionally fused to a C₆₋₁₀aryl or heteroaryl ring system, the 4-7 membered saturated heterocyclic ring or the C₆₋₁₀aryl being optionally substituted with with one or more substituents independently selected from halogen such as fluoro or chloro, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, fluoro-C₁₋₄-alkyl and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy; The Groups R^(10A) and R^(10B)

As defined above, R^(10A) and R^(10B) are each independently selected from hydrogen and C₁₋₆-alkyl such as methyl, ethyl, n- or iso-propyl, n-butyl, isobutyl, sec-butyl and t-butyl, straight or branched pentyl and hexyl, wherein said C₁₋₆-alkyl is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy,

or

R^(10A) and R^(10B), together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring ring such as pyrrolidine, piperidine homopiperidine, piperazine, homopiperazine and morpholine or a heteroaryl ring such as pyrrole, imidazole, indole, isoindole, indazole, and purine, optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, n- or iso-propyl, n-, sec- or tert-butyl, fluoro-C₁₋₄-alkyl such as fluoromethyl, trifluoromethyl, 2-fluoroethyl and 2,2,2-trifluoroethyl and C₁₋₄-alkoxy such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy.

In a presently preferred embodiment of the invention R¹ is CONR³R⁴ or heteroaryl such as benzoxazolyl, indolyl, azaindolyl, imidazolyl, benzimidazolyl, oxazolyl, oxadiazolyl or tetrazolyl, any of which may be optionally substituted with one or more substituents independently selected from, for example, halogen such as fluoro, chloro, cyano, C₁₋₆-alkyl such as methyl, ethyl, propyl, iso-propyl, tert-butyl, n-butyl, C₃₋₅-cycloalkyl such as cyclopropyl, cyclopentyl, C₁₋₄-alkoxy such as methoxy, fluoro-C₁₋₆-alkyl such as trifluoromethyl, fluoro-C₁₋₄-alkoxy, and heteroaryl such as pyridyl.

In an alternative presently preferred embodiment of the invention R¹ is CONR³R⁴ wherein R⁴ is hydrogen or methyl and R³ is selected from tetrahydropyranyl, isopropylmethyl, tetrahydropyranylmethyl, imidazolylethyl, methoxyethyl, N-methylimidazolylmethyl, tetrahydrofuranylmethyl, 1-fluorothyl, oxazolylmethyl, pyridylmethyl, 2,2-difluoromethyl, tetrahydrofuranyl, methyl, ethyl, n- or iso-propyl, n-sec- or tert-butyl, cyclopropyl, hydroxyethyl, cyanoethyl, phenyl, pyridyl, chlorophenyl, methoxyphenyl, methylphenyl, hydroxyphenyl, thiazoloylmethyl, indolyl, methoxypropyl, tetrahydroisoquinolinyl, furylmethylpyridylethyl, thiazolyl, cyclopropylmethyl. In a preferred embodiment any one of the R³ substituents are optionally substituted with one or more optional substituents such as halogen or C₁₋₄ alkyl.

In a presently preferred embodiment of the invention X is a 2,6-pyridyl radical of formula (A).

In an alternative presently preferred embodiment of the invention Y is a homopiperazinyl radical of formula (H) when n is 2, or a piperazine radical of formula (H) when n is 1, either of which being optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, a divalent C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine such as —CH₂CH₂— or —CH₂CH₂CH2-, C₁₋₄-alkoxy such as methoxy, fluoro-C₁₋₄-alkyl such as di- and tri-fluoromethyl, or a divalent fluoro-C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine, and fluoro-C₁₋₄-alkoxy such as mono-, di-, and trifluoromethoxy.

In a yet further presently preferred embodiment of the invention Y is a homopiperazinyl radical of formula (H) when n is 2, or a piperazine radical of formula (H) when n is 1, either of which being optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, a divalent C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine such as -ethylene- or -propylene-, C₁₋₄-alkoxy such as methoxy, fluoro-C₁₋₄-alkyl such as di- and trifluoromethyl, or a divalent fluoro-C₁₋₄-alkylene radical which forms a bridge between ring carbons of said homopiperazine or piperazine, and fluoro-C₁₋₄-alkoxy such as mono-, di-, and tri-fluoromethoxy, and R² is selected from a 4-piperidine radical of formula (N) wherein o is 2 and p is 1, a 1,4-cyclohexyl radical of formula (R) or a —CH₂morphilin-3-yl radical of formula (Q) wherein w is O, and wherein said 4-piperidine, and said 1,4-cyclohexyl and said —CH₂morphilin-3-yl radicals are optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, ethyl, C₁₋₄-alkoxy such as methoxy, fluoro-C₁₋₄-alkyl such as mono-, di-, and tri-fluoromethyl, and fluoro-C₁₋₄-alkoxy such as mono, di-, and tri-fluoromethoxy.

In an alternative presently preferred embodiment of the invention Y is a piperazine radical of formula (H) wherein n is 1, optionally substituted as defined above, and R² is a 4-azepine radical of formula (N) wherein 0 is 2 and p is 2, said 4-azepine radical being optionally substituted with one more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl such as methyl, C₁₋₄-alkoxy such as methoxy, fluoro-C₁₋₄-alkyl such as trifluoromethyl, and fluoro-C₁₋₄-alkoxy.

In a preferred embodiment R³ is pyridyl optionally substituted with one or more substituents selected from halogen such as fluoro or chloro, C₁₋₄-alkyl such as methyl or ethyl or isopropyl, C₁₋₄-alkoxy such as methoxy, or fluoro-C₁₋₄-alkyl.

In an alternative embodiment R³ is 4-pyridyl optionally substituted with one or more methyl groups.

Utilities

The compounds of the invention are useful in the treatment of cancers. Examples of such cancers include cancers of the haematopoietic system such as multiple myeloma and non-Hodgkin's lymphoma. Examples of other drugs which may be used in combination with the compounds of the invention for the treatment of cancers, including for example cancers of the haematopoietic system, include agents that inhibit growth factors such as GCSF and VEGF (e.g. avastin and aflibercept).

The compounds of the invention are also useful in the treatment of injuries including damage to the heart, liver, kidney, brain, and bone. Examples of other drugs which may be used in combination with the compounds of the invention for the treatment of such injuries include agents that inhibit growth factors such as GCSF and VEGF.

The compounds of the invention are useful in the treatment of viral infections, for example HIV/AIDS. Examples of other drugs which may be used in combination with the compounds of the invention for the treatment of viral infections include, for example, CCR5 antagonists including maraviroc and SCH532702, and antiretrovirals including reverse transcriptase inhibitors (e.g. zidovudine, abacavir, didanosine, zalcitabine, stavudine, lamivudine, emtricitabine, tenofovir, adefovir, nevirapine efavirenz, etravirine, delavirdineetc), and HIV protease inhibitors (e.g. saquinavir, ritonavir, indinavir, nelfinavir, amprenavir), and integrase inhibitors (e.g. raltegravir), and antivirals such as acyclovir and plecoranil.

The compounds of the invention are useful in the treatment of neuropathy. An example of neuropathy is HIV related peripheral neuropathy, which affects approximately 50% of HIV patients. Examples of other drugs which may be used in combination with the compounds of the invention for the treatment of neuropathy, including HIV related peripheral neuropathy, include opiates such as fentanyl, anti-epileptics such as gabapentin and pregabalin, and tricyclics such as amitryptiline.

The compounds of the invention are useful in the treatment of retinal neo-vascularisation, which is a major cause of blindness in patients with diabetes and age related macular degeneration. Examples of other drugs which may be used in combination with the compounds of the invention for the treatment of retinal neo-vascularisation include VEGF inhibitors such as avastin and lucentis.

The compounds of the invention are useful in the treatment of several types of cancers, including non-small cell lung, breast and neuroblastoma. Examples of other drugs which may be used in combination with the compounds of the invention for the treatment of cancer include other anti-cancer drugs including anti-angiogenic agents such as avastin and inhibitors of VEGF and PDGF receptors such as lucentis and sutent.

Synthesis

The compounds of formula (I) above may be prepared by, or in analogy with, conventional methods. The preparation of intermediates and compounds according to the examples of the present invention may in particular be illuminated by, but not limited to, the following Schemes. Definitions of variables in the structures in the schemes herein are commensurate with those of the corresponding positions in the formulae delineated herein.

wherein R¹, R², R³, R⁴, X and Y are as defined in formula (I).

Compounds of general formula (I) wherein X is a 2,6-pyridyl radical can easily be prepared from intermediate compounds of general formula (III) (as illustrated in Scheme 1 above) by displacement of the halogen with H—Y—R² or alternatively by displacement of the halogen with H—Y—H (or a suitably protected version thereof) and subsequent addition of the R² group, for example by reductive alkylation with a carbonyl compound of formula O═R². The group H—Y—R² can be prepared for example by reductive alkylation of H—Y—H (or a suitably protected version thereof) with a carbonyl compound of formula O═R². Intermediate compounds of general formula (III) can be readily prepared for example by Suzuki reaction of a boronic acid R¹B(OH)₂ with 2-chloro-6-iodopyridine, by condensation of an amine R³R⁴NH₂ with 6-chloropyridine-2-carboxylic acid or by condensation of an α-halo ketone with 6-chloropyridine-2-carboximidamide. All of these alternatives are exemplified in the experimental section below.

wherein R¹, R², R³, R⁴, X and Y are as defined in formula (I).

Compounds of general formula (I) wherein X is a 2,6-pyridyl radical can alternatively be readily prepared from intermediate compounds of general formula (IV) (as illustrated in Scheme 2 above) for example by condensation with an amine R³R⁴NH₂, by conversion of the carboxylic acid group into a ketone group R³CO, or by conversion of the carboxylic group into a heteroaryl group by standard procedures. Intermediate compounds of general formula (IV) can be easily prepared from intermediate compounds of general formula (V) by deprotection of the tert-butyl ester. Intermediate compounds of general formula (V) can in turn be readily prepared from tert-butyl 6-chloropyridine-2-carboxylate by displacement of the halogen with H—Y—R² or alternatively by displacement of the halogen with H—Y—H (or a suitably protected version thereof) and subsequent addition of the R² group, for example by reductive alkylation with a carbonyl compound of formula O═R². The group H—Y—R² can be prepared for example by reductive alkylation of H—Y—H (or a suitably protected version thereof) with a carbonyl compound of formula O═R². All of these alternatives are exemplified in the experimental section below.

The groups R¹ and R² in Schemes 1 and 2 can also be converted by standard synthetic methods into alternative groups R¹ and R². The routes described in Schemes 1 and 2 refer to X being a 2,6-pyridyl radical of formula (A). Analogous methods can be used to prepare compounds of formula (I) where X is alternatively a radical of formulae (B)-(G) inclusive.

Appropriate reaction conditions for the individual reaction steps are known to a person skilled in the art. Particular reaction conditions for examples of the invention are also described in the experimental section. The necessary starting materials for preparing the compounds of formula (I) are either commercially available, or may be prepared by methods known in the art.

The processes described below in the experimental section may be carried out to give a compound of the invention in the form of a free base or as an acid addition salt. A pharmaceutically acceptable acid addition salt may be obtained by dissolving the free base in a suitable organic solvent and treating the solution with an acid, in accordance with conventional procedures for preparing acid addition salts from base compounds. Examples of addition salt forming acids are mentioned above.

The compounds of formula (I) may possess one or more chiral carbon atoms, and they may therefore be obtained in the form of optical isomers, e.g., as a pure enantiomer, or as a mixture of enantiomers (racemate) or as a mixture containing diastereomers. The separation of mixtures of optical isomers to obtain pure enantiomers is well known in the art and may, for example, be achieved by fractional crystallization of salts with optically active (chiral) acids or by chromatographic separation on chiral columns.

The chemicals used in the synthetic routes delineated herein may include, for example, solvents, reagents, catalysts, and protecting group and deprotecting group reagents. Examples of protecting groups are t-butoxycarbonyl (Boc) and benzyl. The methods described above may also additionally include steps, either before or after the steps described specifically herein, to add or remove suitable protecting groups in order to ultimately allow synthesis of the compounds. In addition, various synthetic steps may be performed in an alternate sequence or order to give the desired compounds. Synthetic chemistry transformations and protecting group methodologies (protection and deprotection) useful in synthesizing applicable compounds are known in the art and include, for example, those described in R. Larock, Comprehensive Organic Transformations, VCH Publishers (1989); T. W. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, 3^(rd) Ed., John Wiley and Sons (1999); L. Fieser and M. Fieser, Fieser and Fieser's Reagents for Organic Synthesis, John Wiley and Sons (1994); and L. Paquette, ed., Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons (1995) and subsequent editions thereof.

The following abbreviations have been used:

aq aqueous BINAP 2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl Boc tert-Butyloxycarbonyl DAST Diethylaminosulfur trifluoride DCE 1,2-Dichloroethane DCM Dichloromethane DIPEA N,N-Diisopropylethylamine DMA Dimethylacetamide DME 1,2-Dimethoxyethane DMF N,N-Dimethylformamide EDC•HCl 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride ES⁺ Electrospray ESI⁺ Electrospray ionization Et₃N Triethylamine Et₂O Diethyl ether EtOAc Ethyl acetate EtOH Ethanol HBTU 2-(1H-Benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate HOBt N-Hydroxybenzotriazole HONB endo-N-Hydroxybicyclo[2.2.1]hept-5-ene-2,3-dicarboximide HPLC High Performance Liquid Chromatography HPLC-MS High Performance Liquid Chromatography-Mass Spectrometry HRMS High Resolution Mass Spectrometry IBX 2-Iodoxybenzoic acid Int Intermediate IPA Isopropanol LCMS Liquid Chromatography Mass Spectrometry M Molar MeCN Acetonitrile MeOH Methanol [MH]⁺ Protonated molecular ion MSD-TOF Mass Selective Detector-Time of Flight NEM N-Ethylmorpholine NMP N-methylpyrrolidone PPh₃ Triphenylphosphine Proc Procedure sat saturated SM Starting material TFA Trifluoroacetic acid THF Tetrahydrofuran TLC Thin Layer Chromatography

The recitation of a listing of chemical groups in any definition of a variable herein includes definitions of that variable as any single group or combination of listed groups. The recitation of an embodiment herein includes that embodiment as any single embodiment or in combination with any other embodiments or portions thereof.

The invention will now be further illustrated by the following non-limiting examples. The specific examples below are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever. Without further elaboration, it is believed that one skilled in the art can, based on the description herein, utilize the present invention to its fullest extent. All references and publications cited herein are hereby incorporated by reference in their entirety.

EXAMPLES AND INTERMEDIATE COMPOUNDS Experimental Methods

All reagents were commercial grade and were used as received without further purification, unless otherwise specified. Reagent grade solvents were used in all cases. High-resolution mass spectra (HRMS) were obtained on an Agilent MSD-TOF connected to an Agilent 1100 HPLC system. During the analyses the calibration was checked by two masses and automatically corrected when needed. Spectra were acquired in positive electrospray mode. The acquired mass range was m/z 100-1100. Profile detection of the mass peaks was used. Analytical HPLC was performed on an Agilent 1100 system using a Phenomenex Synergi, RP-Hydro, 150×4.6 mm, 4 □m column with a flow rate of 1.5 mL per min at 30° C. and a gradient of 5-100% acetonitrile (+0.085% TFA) in water (+0.1% TFA) over 7 min, (200-300 nm), unless otherwise stated. Flash chromatography was performed on either a CombiFlash Companion system equipped with RediSep or GraceResolv silica columns or a Flash Master Personal system equipped with Strata SI-1 silica gigatubes or in a glass column under gravity (ICN silica, 18-32 □m, 60 Å). Reverse Phase HPLC was performed on a Gilson system (Gilson 322 pump with Gilson 321 equilibration pump and Gilson 215 autosampler) equipped with Phenomenex Synergi Hydro RP 150×10 mm, ACE-5AQ, 100×21.20 mm or YMC ODS-A 100/150×20 mm columns. Reverse phase column chromatography was performed on a Gilson system (Gilson 321 pump and Gilson FC204 fraction collector) equipped with Merck LiChroprep® RP-18 (40-63 um) silica columns. Microwave irradiations were carried out using a Biotage or CEM microwave. Hydrogenations were performed using a Thales H-cube or H-cube midi. The compounds were automatically named using ACD 6.0. All compounds were dried in a vacuum oven overnight. Yields have been rounded to the nearest %. Where yields are not included, the intermediates were used crude. Reactions were monitored by TLC, LCMS or HPLC. Reactions were performed at room temperature unless otherwise stated.

Intermediate 1 2-(Dibenzylamino)cyclopentan-1-ol

2-Aminocyclopentanol hydrochloride (500 mg, 3.63 mmol) and benzaldehyde (810 mg, 7.63 mmol) were dissolved in DCM (20 mL), NaBH(OAc)₃ (2.31 g, 10.9 mmol) was added and the reaction mixture was stirred for 24 h. The reaction mixture was diluted with DCM (50 mL), washed with sat aq Na₂CO₃, (40 mL), brine (30 mL) and dried (MgSO₄). The reaction mixture was stirred with isocyanate resin for 18 h, filtered and concentrated in vacuo to give the crude title compound (436 mg, 43%) as a colourless oil. LCMS (ES⁺): 282.1 [MH]⁺.

Intermediate 2 N,N-Dibenzyl-2-fluorocyclopentan-1-amine

Intermediate 1 (400 mg, 1.42 mmol) was dissolved in DCM (20 mL) and DAST (344 mg, 2.13 mmol) was added. The reaction mixture was stirred for 4 h, diluted with DCM (30 mL), washed with sat aq NaHCO₃ (40 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (330 mg, 82%) as a light brown gum. LCMS (ES⁺): 284.1 [MH]⁺.

Intermediate 3 2-Fluorocyclopentan-1-amine

Intermediate 2 (330 mg, 116 mmol) was dissolved in MeOH (15 mL) and hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C. The resulting MeOH solution was used without purification. LCMS (ES⁺): 104.0 [MH]⁺.

Intermediate 4 1-Fluoropropan-2-amine

Fluoroacetone (500 mg, 6.57 mmol), benzylamine (704 mg, 6.57 mmol) and NaBH(OAc)₃ (4.18 g, 19.7 mmol) were dissolved in DCM (20 mL) and stirred for 18 h. The reaction mixture was diluted with DCM (80 mL), washed with sat aq Na₂CO₃ (75 mL), brine (75 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in MeOH (10 mL), 10% Pd/C (100 mg) was added and the reaction mixture was stirred for 4 d under an atmosphere of H₂. The reaction mixture was filtered through celite and the resulting MeOH solution was used without purification. LCMS (ES⁺): 77.8 [MH]⁺.

Intermediate 5 4,4,4-Trifluorobutan-2-amine

Intermediate 5 was prepared similarly to Intermediate 4 using 4,4,4-trifluoro-2-butanone instead of fluoroacetone. LCMS (ES⁺): 128.1 [MH]⁺.

Intermediate 6 1,1-Difluoropropan-2-amine

Intermediate 6 was prepared similarly to Intermediate 4 using 1,1-difluoroacetone instead of fluoroacetone. LCMS (ES⁺): 96.0 [MH]⁺.

Intermediate 7 1-(2-Fluoro-1-fluoromethyl-ethyl)-piperidin-4-one

1,4-Pentadien-3-ol (200 mg, 2.38 mmol) and IBX (999 mg, 3.57 mmol) were dissolved in DCE (15 mL) and heated at 70° C. for 3 h. The reaction mixture was filtered, diluted with MeOH (10 mL) and 2-fluoro-1-fluoromethyl-ethylamine (226 mg, 2.38 mmol) was added. The reaction mixture was stirred at 70° C. for 3 h. Isocyanate resin was added and the reaction mixture stirred at room temperature for 6 h, filtered and concentrated in vacuo to give the crude title compound (160 mg, 38%) as an orange gum. LCMS (ES⁺): 178.1 [MH]⁺.

Intermediates 8-20

Intermediates 8-20 were prepared similarly to Intermediate 7; see Table 1 below.

TABLE 1 Preparation of piperidin-4-one intermediates

LCMS Int Structure SM Yield (ES⁺) Intermediate Name 8

* 44% 156.2 [MH]⁺ 1-[(2R)-Butan-2-yl]piperidin-4- one 9

* 46% 156.2 [MH]⁺ 1-[(2S)-Butan-2-yl]piperidin-4- one 10

Int 4 37% 160.1 [MH]⁺ 1-(1-Fluoropropan-2-yl)piperidin- 4-one 11

Int 6 38% 178.1 [MH]⁺ 1-(1,1-Difluoropropan-2- yl)piperidin-4-one 12

* 33% 196.2 [MH]⁺ 1-[(2S)-1,1,1-Trifluoropropan-2- yl]piperidin-4-one 13

* 33% 196.2 [MH]⁺ 1-[(2R)-1,1,1-Trifluoropropan-2- yl]piperidin-4-one 14

* 29% 210.1 [MH]⁺ 1-(1,1,1-Trifluoro-2- methylpropan-2-yl)piperidin-4- one 15

Int 5 29% 210.1 [MH]⁺ 1-(4,4,4-Trifluorobutan-2- yl)piperidin-4-one 16

Int 3 20% 186.1 [MH]⁺ 1-(2-Fluorocyclopentyl)piperidin- 4-one 17

* 45% 204.1 [MH]⁺ 1-[(1R)-1-Phenylethyl]piperidin- 4-one 18

* 39% 222.1 [MH]⁺ 1-[(1R)-1-(4- Fluorophenyl)ethyl]piperidin-4- one 19

* 43% — 1-[(1R)-2,3-Dihydro-1H-inden-1- yl]piperidin-4-one 20

* 45% 216.1 [MH]⁺ 1-[(1S)-2,3-Dihydro-1H-inden-1- yl]piperidin-4-one * Commercially available

Intermediate 21 1-(2-Methoxyethyl)piperidin-4-one

4-Piperidone hydrochloride monohydrate (1.00 g, 6.50 mmol), 2-bromoethyl methyl ether (1.00 g, 7.20 mmol) and K₂CO₃ (1.80 g, 13.0 mmol) were dissolved in MeCN (20 mL) and the reaction mixture was stirred at 75° C. for 6 h. The reaction mixture was filtered and the solvents removed in vacuo. The residue was dissolved in DCM (30 mL), stirred with isocyanate resin for 2 h, dried (MgSO₄) and concentrated in vacuo to give the crude title compound (180 mg, 18%) as a colourless gum.

Intermediates 22-25

Intermediates 22-25 were prepared similarly to Intermediate 21; see Table 2 below.

TABLE 2 Preparation of piperidin-4-one intermediates

LCMS Intermediate Int Structure Yield (ES⁺) Name 22

20% 156.2 [MH]⁺ 1-(Butan-2-yl) piperidin-4- one 23

11% 170.2 [MH]⁺ 1-(Pentan-3-yl) piperidin-4- one 24

11% 168.2 [MH]⁺ 1-Cyclopentyl- piperidin-4- one 25

91% 224.0 [MH]⁺ 1-[(2-Chloro- phenyl)methyl] piperidin-4- one

Intermediate 26 1-Bromopentan-2-one

2-Pentanone (10.6 mL, 100 mmol) was dissolved in MeOH (60 mL) and cooled to −5 □C. Bromine (5.13 mL, 100 mmol) was added and the reaction mixture was stirred for 4 h keeping the temperature below 10 □C. Water (30 mL) was added and the reaction mixture was stirred overnight at room temperature. The reaction mixture was poured into water (100 mL) and extracted with DCM (2×200 mL). The combined organic fractions were washed with sat aq NaHCO₃ (200 mL), water (200 mL), dried (CaCl₂) and concentrated in vacuo. The residue was purified by Kugelrohr distillation to give the title compound as a pale yellow oil (8.22 g, 50%).

Intermediates 27-32

Intermediates 27-32 were prepared similarly to Intermediate 26; see Table 3 below.

TABLE 3 Preparation of alpha-bromoketones

Int Structure Yield Intermediate Name 27

61% 1-Bromo-3-methylbutan-2-one 28

97% 2-Bromo-1-cyclopropylethan- 1-one 29

32% 3-Bromobutan-2-one 30

32% 3-Bromopentan-2-one 31

50% 2-Bromo-1-cyclopropylpropan- 1-one 32

63% 2-Bromo-1-cyclopropylbutan- 1-one

Intermediate 33 3-Iodohexan-2-one

2-Hexanone (4.94 mL, 39.9 mmol) and iodine (20.2 g, 79.9 mmol) were dissolved in DME (100 mL) and stirred for 24 h. The reaction mixture was diluted with EtOAc (200 mL) and washed with 1M aq potassium thiosulfate (200 mL), 1M aq Na₂CO₃ (200 mL) and water (100 mL). The organic fraction was dried (MgSO₄) and concentrated in vacuo. The residue was purified by Kugelrohr distillation (120 □C, 1 mBar) to give the title compound as a dark brown oil (2.46 g, 27%).

Intermediate 34 tert-Butyl N-{1-[methoxy(methyl)carbamoyl]propyl}carbamate

2-tert-Butoxycarbonylamino-butyric acid (500 mg, 2.46 mmol), HBTU (1.03 g, 2.71 mmol) and DIPEA (1.22 mL, 7.38 mmol) were dissolved in DMF (10 mL) and stirred for 30 min. N,O-dimethylhydroxylamine hydrochloride (360 mg, 3.69 mmol) was added and the reaction mixture was stirred for 1 h. The solvents were removed in vacuo and the residue was purified by column chromatography to give the title compound (380 mg, 63%) as a cream oil. LCMS (ES⁺): 269.2 [MNa]⁺.

Intermediate 35 4-Aminohexan-3-one 2,2,2-trifluoroacetic Acid

Intermediate 34 (4.97 g, 20.2 mmol) was dissolved in THF (100 mL) and ethylmagnesium bromide (20.0 mL, 3.2 M in 2-methyltetrahydrofuran, 64.0 mmol) was added. The reaction mixture was stirred for 4 h, quenched with sat aq NH₄Cl (20 mL) and extracted with EtOAc (2×200 mL). The combined organic fractions were washed with 1 M aq HCl (200 mL), 1 M aq Na₂CO₃ (200 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (100 mL), TFA (25 mL) was added and the reaction mixture was stirred for 3 h and concentrated in vacuo to give the crude title compound (4.98 g) as a red gum. LCMS (ES⁺): 116.2 [MH]⁺.

Intermediate 36 tert-Butyl 6-chloropyridine-2-carboxylate

6-Chloropyridine-2-carboxylic acid (5.00 g, 31.7 mmol) was dissolved in DCM (150 mL) and oxalyl chloride (5.45 mL, 63.5 mmol) and DMF (1 mL) were added. The reaction mixture was stirred for 3 h, concentrated in vacuo and azeotroped with DCM. The residue was dissolved in THF (150 mL) and potassium tert-butoxide (3.39 mg, 47.6 mmol) was added. The reaction mixture was stirred for 18 h, quenched with water (250 mL) and extracted with DCM (3×150 mL). The combined organic fractions were washed with sat aq NaHCO₃ (150 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (3.11 g, 46%) as a white solid. LCMS (ES⁺): 236.1 [MNa]⁺.

Intermediate 37 Methyl 6-chloropyridine-2-carboxylate

6-Chloropyridine-2-carboxylic acid (15.0 g, 0.11 mol) was dissolved in DCM (300 mL) and DMF (1.5 mL) and oxalyl chloride (27.4 g, 0.22 mol) was added dropwise over 10 min. The reaction mixture was stirred for 1 h, MeOH (50 mL) was added dropwise over 5 min and the reaction mixture was stirred for 1.5 h. The solvents were removed in vacuo and the residue azeotroped with DCM (2×150 mL) to give the crude title compound (16.5 g, 100%) as a green solid. LCMS (ES⁺): 154.5 [MH]⁺.

Intermediate 38 6-chloro-N-(cyclopropylmethyl)pyridine-2-carboxamide

6-Chloropyridine-2-carboxylic acid (5.00 g, 31.7 mmol) was dissolved in DCM (100 mL) and DMF (0.5 mL) and oxalyl chloride (6.54 mL, 76.2 mmol) were added dropwise. The reaction mixture was stirred for 2 h, concentrated in vacuo and azeotroped with DCM. The residue was dissolved in DCM (100 mL), DIPEA (22.6 mL, 127 mmol) and aminomethylcyclopropane (5.51 mL, 63.5 mmol) were added dropwise and the reaction mixture was stirred for 4 h. The reaction mixture was washed with sat aq NaHCO₃ solution (250 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (6.50 g, 97%) as a light brown gum. LCMS (ES⁺): 211.2 [MH]⁺.

Intermediates 39-44

Intermediates 39-44 were prepared similarly to Intermediate 38; see Table 4 below.

TABLE 4 Preparation of 6-chloro-pyridine-2-carboxamide intermediates

Int

Crude yield LCMS (ES⁺) Intermediate Name 39

 37% 234.2 [MH]⁺ 6-Chloro-N- (pyridin-4-yl) pyridine-2- carboxamide 40

100% 248.0 [MH]⁺ 6-Chloro-N- (2-methyl- pyridin-4-yl) pyridine-2- carboxamide 41

 96% 248.2 [MH]⁺ 6-Chloro-N- (3-methyl- pyridin-4-yl) pyridine-2- carboxamide 42

 46% 262.1 [MH]⁺ 6-Chloro-N- (2,6-dimethyl- pyridin-4-yl) pyridine-2- carboxamide 43

 94% 248.3 [MH]⁺ 6-Chloro-N- (pyridin-3- ylmethyl) pyridine-2- carboxamide 44

 71% 254.2 [MH]⁺ 6-Chloro-N- (1,3-thiazol-2- ylmethyl) pyridine-2- carboxamide

Intermediate 45 6-Chloropyridine-2-carboxamide

6-Chloropyridine-2-carboxylic acid (1.20 g, 7.62 mmol) and ammonium chloride (0.81 g, 15.2 mmol) were dissolved in DMF (20 mL) and DIPEA (5.31 mL, 30.5 mmol), HONB (2.05 g, 11.4 mmol) and HBTU (4.33 g, 11.4 mmol) were added. The reaction mixture was stirred for 1 h and the solvents were removed in vacuo. The residue was partitioned between DCM (50 mL) and 1 M aq HCl (50 mL) and the aq fraction was extracted with DCM (2×25 mL). The combined organic fractions were washed with sat aq NaHCO₃ (50 mL), brine (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was recrystallised from MeOH/water to give the title compound (1.12 g, 94%) as a white solid. LCMS (ES⁺): 157.4 [MH]⁺.

Intermediate 46 6-Chloro-N-(4-oxohexan-3-yl)pyridine-2-carboxamide

Intermediate 46 was prepared similarly to Intermediate 45, using Intermediate 35 instead of ammonium chloride, to give the crude title compound (33%) as an orange oil. LCMS (ES⁺): 255.1 [MH]⁺.

Intermediate 47 N-Butyl-6-chloropyridine-2-carboxamide

6-Chloro-pyridine-2-carboxylic acid (500 mg, 3.17 mmol), EDC.HCl (1.34 g, 6.98 mmol) and HOBN (1.42 g, 7.93 mmol) were dissolved in DCM (30 mL) and NEM (914 mg, 7.93 mmol) and n-butylamine (376 □L, 3.81 mmol) were added. The reaction mixture was stirred for 16 h, washed with sat aq NaHCO₃ (2×20 mL), 1 M aq HCl (2×20 mL), brine (20 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (321 mg, 48%) as a colourless liquid. LCMS (ES⁺): 213.5 [MH]+.

Intermediate 48 6-Chloro-N-ethylpyridine-2-carboxamide

Intermediate 48 was prepared similarly to Intermediate 47, using ethylamine instead of n-butylamine to give the crude title compound (45%) as a colourless liquid. LCMS (ES⁺): 185.5 [MH]⁺.

Intermediate 49 6-Chloro-N-[3-(1H-imidazol-1-yl)propyl]pyridine-2-carboxamide

6-Chloro-pyridine-2-carboxylic acid (1.00 g, 6.35 mmol) was dissolved in DCM (20 mL) and HOBt (1.03 g, 7.62 mmol), EDC.HCl (1.46 g, 7.62 mmol) and 1-(3-aminopropyl)imidazole (0.95 g, 7.62 mmol) were added. The reaction mixture was stirred for 18 h, diluted with DCM (130 mL) washed with sat aq Na₂CO₃ (100 mL), brine (30 mL), water (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was triturated with water to give the crude title compound (1.05 g, 63%) as an off-white solid. LCMS (ES⁺): 266 [MH]⁺.

Intermediate 50 2-(6-Chloropyridin-2-yl)-1-methyl-1H-indole

2-Chloro-6-iodopyridine (400 mg, 1.67 mmol), N-methylindole-2-boronic acid (292 mg, 1.67 mmol), tetrakis(triphenylphosphine)palladium (O) (154 mg, 0.13 mmol) and Na₂CO₃ (442 mg, 4.18 mmol) were dissolved in water (10 mL) and dioxane (10 mL) and heated using a microwave (110° C., absorption high) for 1 h. The solvents were removed in vacuo and the residue was partitioned between DCM (50 mL) and water (30 mL). The aq fraction was extracted with DCM (30 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo to give the crude title compound (406 mg) as a brown gum. LCMS (ES⁺): 243.2 [MH]⁺.

Intermediates 51-60

Intermediates 51-60 were prepared similarly to Intermediate 50; see Table 5 below.

TABLE 5 Suzuki reactions with 2-Chloro-6-iodopyridine

Crude LCMS Intermediate Int R¹ yield (ES⁺) Name 51

 62% 330.3 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-1H-pyrrolo [3,2-b]pyridine- 1-carboxylate 52

100% 330.3 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-1H-pyrrolo [3,2-c]pyridine- 1-carboxylate 53

 60% 330.3 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-1H-pyrrolo [2,3-c]pyridine- 1-carboxylate 54

 90% 330.3 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-1H-pyrrolo [2,3-b]pyridine- 1-carboxylate 55

 67% 329.0 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-1H-indole- 1-carboxylate 56

 39%* 370.2 [MH]⁺ 2-[1-(Benzene- sulfonyl)-1H- pyrrolo[2,3-b] pyridin-3-yl]- 6-chloro- pyridine 57

 78% 329.0 [MH]⁺ tert-Butyl 3-(6- chloropyridin-2- yl)-11H-indole- 1-carboxylate 58

100% 355.2 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-6-cyano-1H- indole-1- carboxylate 59

100% 359.1 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-6-methoxy- 1H-indole-1- carboxylate 60

100% 359.4 [MH]⁺ tert-Butyl 2-(6- chloropyridin-2- yl)-5-methoxy- 1H-indole-1- carboxylate *Used the corresponding pinacol boronic ester derivative instead of the boronic acid

Intermediate 61 6-Chloropyridine-2-carboximidamide

2-Chloro-6-cyanopyridine (11.2 g, 80.8 mmol) was dissolved in EtOH (200 mL), HCl gas was passed through the solution for 5 min and the reaction mixture was stirred for 18 h. The solvent was removed in vacuo and the residue was dissolved in a 7 M solution of ammonia in MeOH (100 mL) and stirred for 3 d. The solvent was removed in vacuo and the residue triturated with EtOAc (3×50 mL) to give the crude title compound as a pale pink solid (12.3 g, 98%). LCMS (ES⁺): 156.2 [MH]⁺.

Intermediate 62 2-Chloro-6-(5-methyl-1H-imidazol-2-yl)pyridine

Intermediate 61 (500 mg, 3.21 mmol), bromoacetone (296 □L, 3.53 mmol) and K₂CO₃ (444 mg, 3.21 mmol) were dissolved in EtOH (10 mL) and heated at reflux for 2 h. Further bromoacetone (148 □L, 1.77 mmol) was added and the reaction mixture was heated at reflux for 4 h. The solvents were removed in vacuo and the residue was dissolved in 1 M aq Na₂CO₃ (50 mL) and extracted with EtOAc (3×50 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (420 mg, 68%) as an orange gum. LCMS (ES⁺): 194.1 [MH]⁺.

Intermediates 63-74

Intermediates 63-74 were prepared similarly to Intermediate 62 using the appropriate alpha-bromoketone intermediate; see Table 6 below.

TABLE 6 Preparation of imidazoles from Intermediate 61

Crude LCMS Intermediate Int R¹ SM yield (ES⁺) Name 63

* 32% — 2-Chloro-6-(5- ethyl-1H- imidazol-2- yl)pyridine 64

Int 26 77% 222.2 [MH]⁺ 2-Chloro-6-(5- propyl-1H- imidazol-2-yl) pyridine 65

Int 27 73% 222.1 [MH]⁺ 2-Chloro-6-[5- (propan-2-yl)- 1H-imidazol- 2-yl)pyridine 66

Int 28 88% 220.2 [MH]⁺ 2-Chloro-6-(5- cyclopropyl- 1H-imidazol- 2-yl)pyridine 67

* 27% 248.1 [MH]⁺ 2-Chloro-6-[5- (trifluoro- methyl)-1H- imidazol-2- yl]pyridine 68

* 54% 236.2 [MH]⁺ 2-(5-Tert- butyl-1H- imidazol-2- yl)-6-chloro- pyridine 69

* 25% 256.2 [MH]⁺ 2-Chloro-6- (5-phenyl- 1H-imidazol- 2-yl)pyridine 70

Int 29 50% 208.1 [MH]⁺ 2-Chloro-6- (4,5- dimethyl- 1H- imidazol-2- yl)pyridine 71

Int 30 42% 222.2 [MH]⁺ 2-Chloro-6-(5- ethyl-4- methyl-1H- imidazol-2- yl)pyridine 72

Int 31 13% 234.1 [MH]⁺ 2-Chloro-6-(5- cyclopropyl-4- methyl-1H- imidazol-2- yl)pyridine 73

Int 32 15% 248.1 [MH]⁺ 2-Chloro-6-(5- cyclopropyl-4- ethyl-1H- imidazol-2- yl)pyridine 74

Int 33 45% 236.1 [MH]⁺ 2-Chloro-6-(4- methyl-5- propyl-1H- imidazol-2- yl)pyridine * Commercially available

Intermediate 75 2-Chloro-6-(4,5-diethyl-1H-imidazol-2-yl)pyridine

Intermediate 46 (1.81 g, 7.11 mmol) and ammonium acetate (274 mg, 3.55 mmol) were dissolved in 7 M ammonia in methanol (15 mL) and heated using a microwave at 100 □C for 30 min and at 120 □C for 30 min. Further ammonium acetate (1.00 g, 13.0 mmol) was added and the reaction mixture was heated using a microwave at 120 □C for 2 h, poured into water (100 mL) and extracted with DCM (3×100 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (1.54 g, 92%) as a yellow oil. LCMS (ES⁺): 236.1 [MH]⁺.

Intermediate 76 2-Chloro-6-(4-ethyl-1-methyl-1H-imidazol-2-yl)pyridine

Intermediate 63 (203 mg, 0.98 mmol) and NaH (47.0 mg, 60% dispersion in mineral oil, 1.17 mmol) were dissolved in THF (10 mL), iodomethane (67.0 □L, 1.08 mmol) was added and the reaction mixture was stirred for 2 h, poured into water (25 mL) and extracted with EtOAc (3×25 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo to give the crude title compound as a pale yellow oil (212 mg, 98%). LCMS (ES⁺): 222.2 [MH]⁺.

Intermediate 77 2-Chloro-6-{1H-imidazo[4,5-c]pyridin-2-yl}pyridine

6-Chloropyridine-2-carboxylic acid (2.00 g, 12.7 mmol), 3,4-diaminopyridine (1.52 g, 14.0 mmol) and DIPEA (2.43 mL, 14.0 mmol) were dissolved in DMF (20 mL) and HBTU (5.29 g, 14.0 mmol) was added. The reaction mixture was stirred for 48 h and concentrated in vacuo. The residue was dissolved in EtOAc (100 mL), washed with 1 M aq Na₂CO₃ (2×100 mL), water (100 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography, dissolved in AcOH and heated at 120 □C for 50 min. The solvent was removed in vacuo and the residue was suspended in 1 M aq Na₂CO₃ (50 mL) and extracted with EtOAc (5×50 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and recrystallisation from MeOH to give the title compound (534 mg, 37%) as a white solid.

Intermediate 78 tert-Butyl 6-(1,4-diazepan-1-yl)pyridine-2-carboxylate

Intermediate 36 (3.00 g, 14.0 mmol) was dissolved in DMA (60 mL) and homopiperazine (7.03 g, 70.2 mmol) was added. The reaction mixture was heated using a microwave (180° C., absorption high) for 35 min and the solvents were removed in vacuo. The residue was dissolved in DCM (150 mL) and washed with sat aq Na₂CO₃ (100 mL), brine (100 mL), dried (MgSO₄) and the solvents were removed in vacuo to give the crude title compound (3.37 g, 87%) as a yellow liquid. LCMS (ES⁺): 278.1 [MH]⁺.

Intermediates 79-118

Intermediates 79-118 were prepared similarly to Intermediate 78, by reacting 6-chloro-2-substituted pyridines with homopiperazine; see Table 7 below.

TABLE 7 Preparation of 6-(1,4-diazepany-1-yl)-2-substituted pyridine intermediates

Crude LCMS Int R¹ SM yield (ES⁺) Intermediate Name  79

Int 45 — 221.2 [MH]⁺ 6-(1,4-Diazepan-1-yl)pyridine-2- carboxamide  80

Int 48 66% 249.6 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N- ethylpyridine-2-carboxamide  81

Int 38 87% 275.4 [MH]⁺ N-(Cyclopropylmethyl)-6-(1,4- diazepan-1-yl)pyridine-2- carboxamide  82

Int 47 63% 277.7 [MH]⁺ N-Butyl-6-(1,4-diazepan-1- yl)pyridine-2-carboxamide  83

Int 39 90% 298.2 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N-(pyridin- 4-yl)pyridine-2-carboxamide  84

Int 40 78% 312.2 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N-(2- methylpyridin-4-yl)pyridine-2- carboxamide  85

Int 41 — 312.2 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N-(3- methylpyridin-4-yl)pyridine-2- carboxamide  86

Int 42 70% 326.3 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N-(2,6- dimethylpyridin-4-yl)pyridine-2- carboxamide  87

Int 43 80% 312.4 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N- (pyridin-3-ylmethyl)pyridine- 2-carboxamide  88

Int 44 — 318.3 [MH]⁺ 6-(1,4-Diazepan-1-yl)-N-(1,3- thiazol-2-ylmethyl)pyridine-2- carboxamide  89

Int 49 76% — 6-(1,4-Diazepan-1-yl)-N-[3-(1H- imidazol-1-yl)propyl]pyridine-2- carboxamide  90

Int 50 — 307.2 [MH]⁺ 2-[6-(1,4-Diazepan-1-yl)pyridin- 2-yl]-1-methyl-1H-indole  91

Int 51* — 294.4 [MH]⁺ 1-(6-{1H-Pyrrolo[3,2-b]pyridin- 2-yl}pyridin-2-yl)-1,4-diazepane  92

Int 52* 90% 294.4 [MH]⁺ 1-(6-{1H-Pyrrolo[3,2-c]pyridin- 2-yl}pyridin-2-yl)-1,4-diazepane  93

Int 53* — 294.4 [MH]⁺ 1-(6-{1H-Pyrrolo[2,3-c]pyridin- 2-yl}pyridin-2-yl)-1,4-diazepane  94

Int 54* — 294.4 [MH]⁺ 1-(6-{1H-Pyrrolo[2,3-b]pyridin- 2-yl}pyridin-2-yl)-1,4-diazepane  95

Int 55* — 293.1 [MH]⁺ 2-[6-(1,4-Diazepan-1-yl)pyridin- 2-yl]-1H-indole  96

Int 56* — 294.4 [MH]⁺ 1-(6-{1H-Pyrrolo[2,3-b]pyridin- 3-yl}pyridin-2-yl)-1,4-diazepane  97

Int 57* 90% 293.1 [MH]⁺ 3-[6-(1,4-Diazepan-1-yl)pyridin- 2-yl]-1H-indole  98

Int 58* — 318.2 [MH]⁺ 2-[6-(1,4-Diazepan-1-yl)pyridin- 2-yl]-1H-indole-6-carbonitrile  99

Int 59* — 323.2 [MH]⁺ 2-[6-(1,4-Diazepan-1-yl)pyridin- 2-yl]-6-methoxy-1H-indole 100

Int 60* — 323.4 [MH]⁺ 2-[6-(1,4-Diazepan-1-yl)pyridin- 2-yl]-5-methoxy-1H-indole 101

Int 62 — 258.3 [MH]⁺ 1-[6-(5-Methyl-1H-imidazol-2- yl)pyridin-2-yl]-1,4-diazepane 102

Int 77 74% 295.2 [MH]⁺ 1-(6-{1H-Imidazo[4,5-c]pyridin- 2-yl}pyridin-2-yl)-1,4-diazepane 103

Int 63 26% 272 [MH]⁺ 1-[6-(5-Ethyl-1H-imidazol-2- yl)pyridin-2-yl]-1,4-diazepane 104

Int 64 — 286.3 [MH]⁺ 1-[6-(5-Propyl-1H-imidazol-2- yl)pyridin-2-yl]-1,4-diazepane 105

Int 65 — 286.3 [MH]⁺ 1-{6-[5-(Propan-2-yl)-1H- imidazol-2-yl]pyridin-2-yl}-1,4- diazepane 106

Int 66 — 284.2 [MH]⁺ 1-[6-(5-Cyclopropyl-1H-imidazol- 2-yl)pyridin-2-yl]-1,4-diazepane 107

Int 67 61% 312.3 [MH]⁺ 1-{6-[5-(Trifluoromethyl)-1H- imidazol-2-yl]pyridin-2-yl}-1,4- diazepane 108

Int 68 — 300.3 [MH]⁺ 1-[6-(5-tert-Butyl-1H-imidazol- 2-yl)pyridin-2-yl]-1,4-diazepane 109

Int 69 — 320.3 [MH]⁺ 1-[6-(5-Phenyl-1H-imidazol-2- yl)pyridin-2-yl]-1,4-diazepane 110

Int 70 — 272.2 [MH]⁺ 1-[6-(4,5-Dimethyl-1H-imidazol- 2-yl)pyridin-2-yl]-1,4-diazepane 111

Int 71 — 286.3 [MH]⁺ 1-[6-(5-Ethyl-4-methyl-1H- imidazol-2-yl)pyridin-2-yl]-1,4- diazepane 112

Int 75 — 300.3 [MH]⁺ 1-[6-(4,5-Diethyl-1H-imidazol-2- yl)pyridin-2-yl]-1,4-diazepane 113

Int 72 83% 298.2 [MH]⁺ 1-[6-(5-Cyclopropyl-4-methyl- 1H-imidazol-2-yl)pyridin-2-yl]- 1,4-diazepane 114

Int 73 73% 312.3 [MH]⁺ 1-[6-(5-Cyclopropyl-4-ethyl-1H- imidazol-2-yl)pyridin-2-yl]-1,4- diazepane 115

Int 74 — 300.2 [MH]⁺ 1-[6-(4-Methyl-5-propyl-1H- imidazol-2-yl)pyridin-2-yl]-1,4- diazepane 116

# 58% 203.1 [MH]⁺ 6-(1,4-Diazepan-1-yl)pyridine-2- carbonitrile 117

Int 76 — 286.2 [MH]⁺ 1-[6-(4-Ethyl-1-methyl-1H- imidazol-2-yl)pyridin-2-yl]-1,4- diazepane 118

Int 37 46% 236.6 [MH]⁺ Methyl 6-(1,4-diazepan-1- yl)pyridine-2-carboxylate *The Boc/benzenesulfonyl protecting group is removed during the course of this reaction #Commercially available

Intermediate 119 N-(Cyclopropylmethyl)-6-[4-(piperidin-4-yl)-1,4-diazepan-1-yl]pyridine-2-carboxamide

Intermediate 81 (1.50 g, 5.50 mmol) and 4-oxo-piperidine-1-carboxylic acid tert butylester (1.09 g, 5.50 mmol) were dissolved in DCM (30 mL) and NaBH(OAc)₃ (5.79 g, 27.3 mmol) was added. The reaction mixture was stirred for 4 d, diluted with DCM (150 mL), washed with sat aq Na₂CO₃ (2×75 mL), brine (75 mL) and dried (MgSO₄). The reaction mixture was stirred with isocyanate resin for 2 h and the solvents were removed in vacuo. The residue was dissolved in DCM (40 mL), TFA (4 mL) was added and the reaction mixture was stirred for 18 h. The solvents were removed in vacuo and the residue was desalted (K₂CO₃ in DCM) and purified by column chromatography to give the title compound (600 mg, 31%) as a colourless gum. LCMS (ES⁺): 357.8 [MH]+.

Intermediates 120-124

Intermediates 120-124 were prepared similarly to Intermediate 119, by reacting 6-(1,4-diazepany-1-yl)-2-substituted pyridines with 4-oxo-piperidine-1-carboxylic acid tert butylester and removing the Boc protecting group; see Table 8 below.

TABLE 8 Preparation of 6-[4-(piperidin-4-yl)-1,4-diazepan-1-yl]-2-substituted pyridine intermediates

LCMS Int R¹ SM Yield (ES⁺) Intermediate Name 120

Int 79 33% 304.2 [MH]⁺ 6-[4-(Piperidin-4-yl)-1,4- diazepan-1-yl]pyridine-2- carboxamide 121

Int 80 — — N-Ethyl-6-[4-(piperidin-4-yl)- 1,4-diazepan-1-yl]pyridine-2- carboxamide 122

Int 82 — — N-Butyl-6-[4-(piperidin-4-yl)- 1,4-diazepan-1-yl]pyridine-2- carboxamide 123

Int 89 38% — N-[3-(1H-Imidazol-1-yl)propyl]- 6-[4-(piperidin-4-yl)-1,4- diazepan-1-yl]pyridine-2- carboxamide 124

Int 118 33% 319.7 [MH]⁺ Methyl 6-[4-(piperidin-4-yl)- 1,4-diazepan-1-yl]pyridine-2- carboxylate

Intermediate 125 6-[4-(3-Fluoropiperidin-4-yl)-1,4-diazepan-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 125 was prepared similarly to Intermediate 119, using Intermediate 83 instead of Intermediate 81 and tert-butyl 3-fluoro-4-oxopiperidine-1-carboxylate instead of 4-oxo-piperidine-1-carboxylic acid tert butylester, to give the title compound (9%) as a colourless gum. LCMS (ES⁺): 399.4 [MH]⁺.

Intermediate 126 1-[6-(5-Cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]-4-(3-fluoropiperidin-4-yl)-1,4-diazepane

Intermediate 126 was prepared similarly to Intermediate 119, using Intermediate 106 instead of Intermediate 81 and tert-butyl 3-fluoro-4-oxopiperidine-1-carboxylate instead of 4-oxo-piperidine-1-carboxylic acid tert butylester, to give the title compound (1%) as a pale yellow solid.

Intermediate 127 6-[4-(2-Methylpiperidin-4-yl)-1,4-diazepan-1-yl]-N-(pyridin-3-ylmethyl)pyridine-2-carboxamide

Intermediate 127 was prepared similarly to Intermediate 119, using Intermediate 87 instead of Intermediate 81 and tert-butyl 2-methyl-4-oxopiperidine-1-carboxylate instead of 4-oxo-piperidine-1-carboxylic acid tert butylester, to give the title compound (49%) as a colourless gum.

Intermediate 128 6-{4-[(3R,4R)-3-Hydroxypiperidin-4-yl]-1,4-diazepan-1-yl}-N-(pyridin-3-ylmethyl) pyridine-2-carboxamide

Intermediate 87 (2.00 g, 7.29 mmol) was dissolved in EtOH (30 mL) and tert-butyl 7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (4.36 g, 21.9 mmol) and Et₃N (2.03 mL, 14.6 mmol) were added. The reaction mixture was heated at reflux for 20 h, diluted with DCM (200 mL), washed with sat aq Na₂CO₃ (100 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC. The residue was dissolved in DCM (2 mL), TFA (0.5 mL) was added and the reaction mixture was stirred for 5 h. The solvents were removed in vacuo and the residue was dissolved in DCM (50 mL), washed with sat aq Na₂CO₃ (25 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound.

Intermediate 129 tert-Butyl 6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxylate

Intermediate 78 (3.37 g, 12.2 mmol) was dissolved in DCM (125 mL) and 1-(propan-2-yl)piperidin-4-one (3.61 mL, 24.3 mmol) and NaBH(OAc)₃ (12.9 g, 60.8 mmol) were added. The reaction mixture was stirred for 18 h, diluted with DCM (250 mL) and quenched with sat aq Na₂CO₃ (150 mL). The aq fraction was extracted with DCM (2×100 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (3.29 g, 67%) as a yellow liquid. LCMS (ES⁺): 403.5 [MH]⁺.

Intermediates 130-133

Intermediates 130-133 were prepared similarly to Intermediate 129, by reductive alkylation of 6-(1,4-diazepany-1-yl)-2-substituted pyridines; see Table 9 below.

TABLE 9 Reductive alkylation of 6-(1,4-diazepany-1-yl)-2-substituted pyridines

SMs/ LCMS Int R¹ R⁶ Yield (ES⁺) Intermediate Name 130

Int 25 Int 78 67% 403.5 [MH]⁺ tert-Butyl 6-(4-{1-[(2- chlorophenyl)methyl]piperidin-4- yl}-1,4-diazepan-1-yl)pyridine-2- carboxylate 131

Int 116 45% 328.2 [MH]⁺ 6-{4-[1-(Propan-2-yl)piperidin-4- yl]-1,4-diazepan-1-yl}pyridine-2- carbonitrile 132

Int 8 Int 116  1% 342.2 [MH]⁺ 6-(4-{1-[(2R)-Butan-2- yl]piperidin-4-yl}-1,4-diazepan-1- yl)pyridine-2-carbonitrile 133

Int 25 Int 124 26% 443.7 [MH]⁺ Methyl 6-(4-{1-[(2- chlorophenyl)methyl]piperidin-4- yl}-1,4-diazepan-1-yl)pyridine-2- carboxylate

Intermediate 134 6-[4-(4-tert-Butylcyclohexyl)-1,4-diazepan-1-yl]pyridine-2-carboxylic Acid

Intermediate 78 (1.00 g, 3.61 mmol) and 4-tert-butylcyclohexanone (560 mg, 3.61 mmol) were dissolved in DCM (50 mL) and NaBH(OAc)₃ (3.06 g, 14.4 mmol) was added. The reaction mixture was stirred for 3 d, diluted with DCM (150 mL), washed with sat aq Na₂CO₃ (100 mL), brine (75 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (75 mL) and TFA (6 mL) and stirred for 8 d. The solvents were removed in vacuo and the residue was purified by reverse phase column chromatography to give the title compound (536 mg, 41%) as a white solid. LCMS (ES⁺): 360.5 [MH]⁺.

Intermediate 135 6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxylic Acid

Intermediate 129 (3.29 g, 8.17 mmol) was dissolved in DCM (80 mL), TFA (40 mL) was added and the reaction mixture was stirred for 18 h. The solvents were removed in vacuo and the residue was neutralised with 1M aq Na₂CO₃. The aq solution was washed with DCM, concentrated in vacuo and purified by reverse phase column chromatography to give the title compound (2.19 g, 77%) as a white solid. LCMS (ES⁺): 347.5 [MH]⁺.

Intermediate 136 6-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)pyridine-2-carboxylic Acid

Intermediate 136 was prepared similarly to Intermediate 135, using Intermediate 130 instead of Intermediate 129 to give the title compound (77%) as a white solid. LCMS (ES⁺): 347.5 [MH]⁺.

Intermediate 137 N-Hydroxy-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboximidamide

Intermediate 131 (830 mg, 2.53 mmol) was dissolved in EtOH (20 mL) and hydroxylamine hydrochloride (880 mg, 12.7 mmol) and NaHCO₃ (1.06 g, 12.7 mmol) were added. The reaction mixture was heated under reflux at 80° C. for 2 h. The reaction mixture was concentrated and the precipitate removed by filtration. The mother liquor was concentrated in vacuo to give the crude title compound (910 mg, 99%) as a light yellow gum. LCMS (ES⁺): 361.1 [MH]⁺.

Intermediate 138 1-[6-(5-Methyl-1,2,4-oxadiazol-3-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 138 was prepared similarly to Intermediate 137, using Intermediate 132 instead of Intermediate 131, to give the crude title compound (65%) as a yellow gum. LCMS (ES⁺): 375.3 [MH]⁺.

Intermediate 139 1-[1-(Propan-2-yl)piperidin-4-yl]-4-[6-(2H-1,2,3,4-tetrazol-5-yl)pyridin-2-yl]-1,4-diazepane

Intermediate 131 (982 mg, 3.00 mmol), NaN₃ (215 mg, 3.30 mmol) and NH₄Cl (250 mg, 4.50 mmol) were dissolved in DMF (5 mL) and heated at 120° C. for 4 h. Further NH₄Cl (125 mg, 2.25 mmol) was added and the reaction mixture was heated at 120° C. for 5.5 h. The solvent was removed in vacuo, NaN₃ (100 mg, 1.53 mmol) was added and the reaction mixture was heated at 120° C. for 7 h. The residue was purified by column chromatography to give the title compound (168 mg, 15%) as a dark red solid.

Intermediate 140 tert-Butyl N-{[methoxy(methyl)carbamoyl]methyl}carbamate

2-{[(tert-Butoxy)carbonyl]amino}acetic acid (5.00 g, 28.5 mmol) was dissolved in DCM (50 mL), CDI (5.09 g, 31.4 mmol) was added and the reaction mixture was stirred for 1 h. N,O-dimethylhydroxylamine hydrochloride (3.06 g, 31.4 mmol) was added and the reaction mixture was stirred for 16 h. EtOAc (150 mL) was added and the reaction mixture was washed with 1 M aq HCl (50 mL), sat aq NaHCO₃ (2×50 mL), dried (Na₂SO₄) and concentrated in vacuo to give the crude title compound (5.13 g, 82%) as a white solid.

Intermediate 141 tert-Butyl N-(2-oxohexyl)carbamate

Intermediate 140 (1.09 g, 5.00 mmol) was dissolved in THF (10 mL) at −10° C., n-butylmagnesium chloride (7.50 mL, 2.0 M in THF, 15.0 mmol) was added and the reaction mixture was warmed to room temperature overnight. Sat aq NH₄Cl (60 mL) was added and the reaction mixture was extracted with EtOAc (3×20 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (1.00 g, 93%) as a colourless oil.

Intermediate 142 1-Aminohexan-2-one Hydrochloride

Intermediate 141 (995 mg, 4.62 mmol) was dissolved in HCl (10 mL, 4.0 M in dioxane) and the reaction mixture was stirred for 4 h. The solvents were removed in vacuo to give the crude title compound (653 mg, 94%) as an off-white solid.

Intermediate 143 N-(2-Oxohexyl)-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 142 (252 mg, 1.66 mmol), Intermediate 135 (1.33 g, 1.66 mmol) and HBTU (760 mg, 1.99 mmol) were dissolved in DCM (7.5 mL) and DMF (2.5 mL), DIPEA (1.72 g, 13.3 mmol) was added and the reaction mixture was stirred overnight. DCM (10 mL) was added and the reaction mixture was washed with water (3×5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (457 mg, 62%) as an off-white solid.

Intermediate 144 Methyl 6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxylate

Intermediate 129 (105 mg, 0.26 mmol) was dissolved in HCl (2 mL, 4.0 M in dioxane) and DCM (2 mL) and the reaction mixture was stirred overnight. MeOH (4 mL) was added, the reaction mixture was heated at 110° C. for 7.5 h and the solvents were removed in vacuo. The residue was partitioned between EtOAc and sat aq NaHCO₃, and the organic fraction was dried (MgSO₄) and concentrated in vacuo to give the crude title compound (59.0 mg, 63%) as an orange oil.

Intermediate 145 6-{4-[1-(Propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carbohydrazide

Intermediate 144 (300 mg, 0.83 mmol) and hydrazine hydrate (280 mg, 5.60 mmol) were dissolved in MeOH (5 ml) and stirred overnight. The solvents were removed in vacuo, the residue was dissolved in MeOH and the solvents were removed in vacuo to give the crude title compound (265 mg, 89%) as a pale yellow glass.

Intermediate 146 N′-[(6-{4-[1-(Propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridin-2-yl)carbonyl]cyclopropanecarbohydrazide

Intermediate 145 (60.0 mg, 0.16 mmol) and Et₃N (81.0 mg, 0.80 mmol) were dissolved in DCM, cooled to 0° C. and a solution of cyclopropanecarbonyl chloride (16.7 mg, 0.16 mmol) in DCM was added. The reaction mixture was warmed to room temperature overnight. DCM was added and the reaction mixture was washed twice with sat aq Na₂CO₃, dried (MgSO₄) and concentrated in vacuo to give the crude title compound (58.0 mg, 85%) as an off-white solid. LCMS (ES⁺): 429 [MH]⁺.

Intermediate 147 1-(6-{4-[1-(Propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridin-2-yl)propan-1-one

Intermediate 131 (320 mg, 0.98 mmol) was dissolved in THF (10 mL) and cooled to 0° C. Ethylmagnesium chloride (1.50 mL, 2.0 M in THF, 3.00 mmol) was added dropwise and the reaction mixture was heated at reflux for 4 h. The reaction mixture was quenched with sat aq NH₄Cl (20 mL) and sat aq Na₂CO₃ (20 mL) and extracted with EtOAc (20 mL×2). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo to give the crude title compound (300 mg, 85%) as an orange gum.

Intermediate 148 (2E)-3-(Dimethylamino)-2-methyl-1-(6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridin-2-yl)prop-2-en-1-one

Intermediate 147 (300 mg, 0.84 mmol) was dissolved in DMF/DMA (3 mL) and heated at reflux overnight. The solvents were removed in vacuo and the residue was purified by reverse phase HPLC to give the title compound (45.0 mg, 20%) as an orange gum. LCMS (ES⁺): 414.4 [MH]⁺.

Intermediate 149 tert-Butyl 5-methyl-1,4-diazepane-1-carboxylate

5-Methyl-[1,4]diazepane (600 mg, 5.25 mmol) was dissolved in DMF (7.5 mL) and cooled to 0 □C. A solution of di-tert-butyl-dicarbonate (1.03 g, 4.70 mmol) and triethylamine (3.60 mL, 26.0 mmol) in DCM (1 mL) was added dropwise over 3 h. The solvents were removed in vacuo and the residue dissolved in DCM (20 mL) and washed with sat aq Na₂CO₃ (5 mL). The aq fraction was extracted with DCM (3×50 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography, dissolved in DCM (20 mL) and washed with 2 M aq NaOH (10 mL). The aq fraction was extracted with DCM (3×50 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo to give the title compound (194 mg, 17%) as a yellow oil. LCMS (ES⁺): 215.3 [MH]⁺.

Intermediate 150 N-(Cyclopropylmethyl)-6-(7-methyl-1,4-diazepan-1-yl)pyridine-2-carboxamide

Intermediate 38 (60.5 mg, 0.29 mmol), Intermediate 149 (123 mg, 0.57 mmol) and DIPEA (200 □L, 1.15 mmol) was dissolved in NMP (750 □L) and heated using a microwave (185° C., absorption high) for 80 min. The solvents were removed in vacuo and the residue was dissolved in DCM (10 mL) and washed with sat aq Na₂CO₃ (1 mL). The aq fraction was extracted with DCM (3×20 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the crude title compound (50.0 mg) as a brown oil. LCMS (ES⁺): 289.4 [MH]⁺.

Intermediate 151 1-Benzyl-5,5-dihydrogenio-1,4-diazepane

1-Benzyl-1,4-diazepan-5-one (2.00 g, 9.79 mmol) was dissolved in THF (40 mL), LiAlD₄ (9.80 mL, 2.0 M in THF, 19.6 mmol) was added dropwise over 5 min and the reaction mixture was stirred for 24 h. The reaction mixture was quenched with sat aq NaHCO₃, filtered and concentrated in vacuo to give the crude title compound (1.80 g, 96%) as a pale yellow gum.

Intermediate 152 6-(4-Benzyl-7,7-dihydrogenio-1,4-diazepan-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 39 (800 mg, 3.42 mmol) and Intermediate 151 (988 mg, 5.14 mmol) were dissolved in NMP (2 mL) and the reaction mixture was heated using a microwave (200° C., absorption high) for 3 h. The residue was purified by reverse phase HPLC to give the title compound (320 mg, 24%) as a pale yellow gum. LCMS (ES⁺): 390.4 [MH]⁺.

Intermediates 153-156

Intermediates 153-156 were prepared similarly to Intermediate 152, by reacting 6-chloro-2-substituted pyridines with substituted homopiperazines; see Table 10 below.

TABLE 10 Preparation of piperidin-4-one intermediates

SMs/ LCMS Int Structure Yield (ES⁺) Intermediate Name 153

Int 38 Int 151 48% 277.4 [MH]⁺ 6-(4-Benzyl-7,7-dihydrogenio- 1,4-diazepan-1-yl)-N- (cyclopropylmethyl)pyridine- 2-carboxamide 154

312.4 [MH]⁺ 6-(6-Methyl-1,4-diazepan-1-yl)- N-(pyridin-4-yl)pyridine-2- carboxamide 155

291.1 [MH]⁺ N-(Cyclopropylmethyl)-6-(6- hydroxy-1,4-diazepan-1- yl)pyridine-2-carboxamide 156

289.4 [MH]⁺ N-(Cyclopropylmethyl)-6-(5- methyl-1,4-diazepan-1- yl)pyridine-2-carboxamide

Intermediate 157 6-(7,7-Dihydrogenio-1,4-diazepan-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 152 (315 mg, 0.81 mmol) was dissolved in MeOH (60 mL) and hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C. The solvents were removed in vacuo to give the crude title compound (186 mg, 77%) as a white solid. LCMS (ES⁺): 300.5 [MH]⁺.

Intermediate 158 N-(Cyclopropylmethyl)-6-(7,7-dihydrogenio-1,4-diazepan-1-yl)pyridine-2-carboxamide

Intermediate 158 was prepared similarly to Intermediate 157, using Intermediate 153 instead of Intermediate 152, to give the title compound (48%) as a light yellow gum. LCMS (ES⁺): 277.4 [MH]⁺.

Intermediate 159 7,7-Dihydrogenio-1-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 151 (150 mg, 0.78 mmol), 1-(propan-2-yl)piperidin-4-one (110 mg, 0.78 mmol) and NaBH(OAc)₃ (496 mg, 2.34 mmol) were dissolved in DCM (15 mL) and stirred for 4 d. The reaction mixture was diluted with DCM (25 mL), washed with sat aq Na₂CO₃ (40 mL), brine (40 mL), dried (MgSO₄) and stirred with isocyanate resin for 3 h. The reaction mixture was filtered and the solvents removed in vacuo. The residue was dissolved in MeOH (25 mL) and hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C. The solvents were removed in vacuo to give the crude title compound (135 mg, 76%) as a colourless gum. LCMS (ES⁺): 228.5 [MH]⁺.

Intermediate 160 1-Benzyl-3-methyl-1,4-diazepan-5-one

1-Benzyl-3-methyl-piperidin-4-one (5.00 g, 24.6 mmol) was dissolved in CHCl₃ (50 mL), the reaction mixture was cooled to 0° C. and cone H₂SO₄ (12 mL) was added dropwise. NaN₃ (3.20 g, 49.2 mmol) was added portionwise over 10 min and the reaction mixture was stirred at room temperature for 18 h and at 50° C. for 2 h. Iced water (120 mL) was added and the reaction mixture was neutralized with NaOH, extracted with DCM (2×50 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (4.86 g, 91%) as an off-white solid. LCMS (ES⁺): 219.3 [MH]⁺.

Intermediate 161 1-Benzyl-3-methyl-1,4-diazepane

Intermediate 160 (4.86 g, 22.3 mmol) was dissolved in Et₂O (100 mL) and LiAlH₄ (11.7 mL, 4.0 M in Et₂O, 46.8 mmol) was added dropwise over 10 min. The reaction mixture was stirred for 4 h, quenched with water, filtered, dried (MgSO₄) and concentrated in vacuo to give the crude title compound (4.15 g, 91%) as a colourless gum. LCMS (ES⁺): 205.3 [MH]⁺.

Intermediate 162 1-Benzyl-5,5-dihydrogenio-3-methyl-1,4-diazepane

Intermediate 162 was prepared similarly to Intermediate 161, using LiAlD₄ instead of LiAlH₄, to give the crude title compound (84%) as a light yellow gum. LCMS (ES⁺): 207.3 [MH]⁺.

Intermediates 163-172

Intermediates 163-172 were prepared similarly to Intermediate 159, by reductive alkylation of substituted benzyl homopiperazines with the appropriate ketone and subsequent debenzylation; see Table 11 below.

TABLE 11 Preparation of piperidin-4-yl-homopiperazine intermediates

LCMS Int Structure SMs/Yield (ES⁺) Intermediate Name 163

286.5 [MH]⁺ tert-Butyl 4-(7,7-dihydrogenio- 1,4-diazepan-1-yl)piperidine-1- carboxylate 164

Int 151 Int 8 47% 242.3 [MH]⁺ 1-{1-[(2R)-Butan-2- yl]piperidin-4-yl}-7,7- dihydrogenio-1,4-diazepane 165

Int 151 Int 9 75% 242.3 [MH]⁺ 1-{1-[(2S)-Butan-2- yl]piperidin-4-yl}-7,7- dihydrogenio-1,4-diazepane 166

Int 151 Int 12 46% 282.3 [MH]⁺ 7,7-Dihydrogenio-1-{1-[(2S)- 1,1,1-trifluoropropan-2- yl]piperidin-4-yl}-1,4-diazepane 167

Int 151 Int 24 30% 254.3 [MH]⁺ 1-(1-Cyclopentylpiperidin-4-yl)- 7,7-dihydrogenio-1,4-diazepane 168

240.4 [MH]⁺ 2-Methyl-1-[1-(propan-2- yl)piperidin-4-yl]-1,4-diazepane 169

242.5 [MH]⁺ 7,7-Dihydrogenio-2-methyl-1- [1-(propan-2-yl)piperidin-4-yl]- 1,4-diazepane 170

Int 162 Int 12 54% 296.5 [MH]⁺ 7,7-Dihydrogenio-2-methyl-1- {1-[(2S)-1,1,1-trifluoropropan- 2-yl]piperidin-4-yl}-1,4- diazepane 171

300.3 [MH]⁺ tert-Butyl 4-(7,7-dihydrogenio- 2-methyl-1,4-diazepan-1- yl)piperidine-1-carboxylate 172

252.2 [MH]⁺ 6-[1-(Propan-2-yl)piperidin-4- yl]-3,6- diazabicyclo[3.2.2]nonane *Commercially available

Intermediate 173 6-Bromo-N-(pyridin-4-yl)pyridine-2-carboxamide

2-Bromopyridine-6-carboxylic acid (5.00 g, 24.8 mmol) was dissolved in DCM (100 mL) and DMF (1 mL), and oxalyl chloride (7.54 g, 59.4 mmol) was added dropwise over 5 min. The reaction mixture was stirred for 2 h and the solvents were removed in vacuo. The reaction mixture was azeotroped twice with DCM and dissolved in DCM (100 mL). DIPEA (12.8 g, 99.0 mmol) and 4-aminopyridine (4.66 g, 49.5 mmol) were added dropwise and the reaction mixture was stirred for 2 h, washed with sat aq NaHCO₃ (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was recrystallised from MeOH to give the title compound (5.00 g, 73%) as an off white solid. LCMS (ES⁺): 278.2 [MH]⁺.

Intermediate 174 6-Bromo-N-(cyclopropylmethyl)pyridine-2-carboxamide

Intermediate 174 was prepared similarly to Intermediate 173, using aminomethylcyclopropane instead of 4-aminopyridine, to give the title compound (77%) as a light yellow solid. LCMS (ES⁺): 255.2 [MH]⁺.

Intermediate 175 6-[5,5-Dihydrogenio-4-(piperidin-4-yl)-1,4-diazepan-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 163 (734 mg, 2.57 mmol), Intermediate 173 (650 mg, 2.34 mmol), caesium carbonate (1.14 g, 3.51 mmol), palladium acetate (37.0 mg, 0.16 mmol) and BINAP (146 mg, 0.23 mmol) were suspended in dioxane (10 ml). The reaction mixture was degassed for 15 min and heated at 95° C. for 18 h. The reaction mixture was concentrated in vacuo, dissolved in DCM, filtered and concentrated in vacuo. The residue was purified by column chromatography. The residue was dissolved in DCM (8 mL), TFA (4 mL) was added and the reaction mixture was stirred for 2 h. The solvents were removed in vacuo and the residue was partitioned between DCM (40 mL) and sat aq Na₂CO₃ (40 mL). The aq fraction was extracted with DCM (2×40 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo to give the title compound (602 mg, 67%) as a yellow liquid. LCMS (ES⁺): 383.6 [MH]⁺.

Intermediate 176 6-[4-(3-Fluoropiperidin-4-yl)-7,7-dihydrogenio-1,4-diazepan-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 157 (75.0 mg, 0.25 mmol) and tert-butyl 3-fluoro-4-oxopiperidine-1-carboxylate (54.4 mg, 0.25 mmol) were dissolved in DCM (10 mL) and NaBH(OAc)₃ (266 mg, 1.25 mmol) was added. The reaction mixture was stirred for 20 d, diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (40 mL), brine (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC and dissolved in MeOH (10 mL) and TFA (1 mL). The reaction mixture was stirred for 18 h and the solvents were removed in vacuo to give the title compound.

Intermediate 177 1-[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]-4-(3-fluoropiperidin-4-yl)-1,4-diazepane

Intermediate 177 was prepared similarly to Intermediate 176, using Intermediate 113 instead of Intermediate 157, to give the crude title compound (100%) as a yellow liquid. LCMS (ES⁺): 399.2 [MH]⁺.

Intermediate 178 tert-Butyl 4-(4-benzyl-7,7-dihydrogenio-1,4-diazepan-1-yl)-3-fluoropiperidine-1-carboxylate

Intermediate 151 (400 mg, 2.08 mmol), 3-fluoro-4-oxo-piperidine-1-carboxylic acid tert-butyl ester (452 mg, 2.08 mmol) and NaBH(OAc)₃ (1.32 g, 6.24 mmol) were dissolved in DCM (25 mL) and stirred for 4 d. The reaction mixture was diluted with DCM (25 mL), washed with sat aq Na₂CO₃ (40 mL), brine (40 mL), dried (MgSO₄) and stirred with isocyanate resin for 3 h. The reaction mixture was filtered and concentrated in vacuo to give the crude title compound (480 mg, 59%) as a colourless gum. LCMS (ES⁺): 394.5 [MH]⁺.

Intermediate 179 tert-Butyl 4-(4-benzyl-1,4-diazepan-1-yl)-3-fluoropiperidine-1-carboxylate

Intermediate 179 was prepared similarly to Intermediate 178, using 1-benzyl-1,4-diazepane instead of Intermediate 151, to give the crude title compound (42%) as a colourless gum. LCMS (ES⁺): 392.5 [MH]⁺.

Intermediate 180 1-Benzyl-4-[3-fluoro-1-(propan-2-yl)piperidin-4-yl]-5,5-dihydrogenio-1,4-diazepane

Intermediate 178 (480 mg, 1.22 mmol) was dissolved in MeOH (20 mL) and TFA (2 mL) and stirred for 18 h. The solvents were removed in vacuo, the residue was dissolved in DCM (20 mL) and acetone (142 mg, 2.44 mmol) and NaBH(OAc)₃ (1.29 g, 6.10 mmol) were added. The reaction mixture was stirred for 18 h, diluted with DCM (20 mL), washed with sat aq Na₂CO₃ (25 mL), dried (MgSO₄) and stirred with isocyanate resin for 18 h. The reaction mixture was filtered and concentrated in vacuo to give the crude title compound (300 mg, 73%) as a colourless gum. LCMS (ES⁺): 336.5 [MH]⁺.

Intermediate 181 1-benzyl-4-[3-fluoro-1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 181 was prepared similarly to Intermediate 180, using Intermediate 179 instead of Intermediate 178, to give the title compound (71%) as a white solid. LCMS (ES⁺): 334.5 [MH]⁺.

Intermediate 182 1-[3-Fluoro-1-(propan-2-yl)piperidin-4-yl]-7,7-dihydrogenio-1,4-diazepane

Intermediate 180 was dissolved in MeOH (30 mL) and hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C. The solvents were removed in vacuo to give the crude title compound (155 mg, 71%) as a colourless gum. LCMS (ES⁺): 246.4 [MH]⁺.

Intermediate 183 1-[3-Fluoro-1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 183 was prepared similarly to Intermediate 182, using Intermediate 181 instead of Intermediate 180, to give the crude title compound (73%) as a colourless gum. LCMS (ES⁺): 244.4 [MH]⁺.

Intermediate 184 N-Methoxy-N-methyl-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 135 (500 mg, 1.44 mmol), N,O-dimethylhydroxylamine hydrochloride (422 mg, 4.33 mmol), DIPEA (1.76 mL, 10.1 mmol) and HBTU (547 mg, 1.44 mmol) were dissolved in DMF (8 mL) and stirred for 20 h. The solvents were removed in vacuo and the residue was diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (380 mg, 68%) as a white solid. LCMS (ES⁺): 390.5 [MH]⁺.

Intermediate 185 6-[5,5-Dihydrogenio-3-methyl-4-(piperidin-4-yl)-1,4-diazepan-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 185 was prepared similarly to Intermediate 175, using Intermediate 171 instead of Intermediate 163, to give the title compound (21%) as a yellow liquid. LCMS (ES⁺): 397.2 [MH]⁺.

Intermediate 186 tert-Butyl 4-{3-benzyl-3,6-diazabicyclo[3.2.2]nonan-6-yl}-3-fluoropiperidine-1-carboxylate

Intermediate 186 was prepared similarly to Intermediate 178, using 3-benzyl-3,6-diaza-bicyclo[3.2.2]nonane instead of Intermediate 151, to give the title compound (93%) as a pale yellow gum. LCMS (ES⁺): 418.4 [MH]⁺.

Intermediate 187 3-Benzyl-6-[3-fluoro-1-(propan-2-yl)piperidin-4-yl]-3,6-diazabicyclo[3.2.2]nonane

Intermediate 187 was prepared similarly to Intermediate 180, using Intermediate 186 instead of Intermediate 178, to give the title compound (90%) as a pale yellow gum. LCMS (ES⁺): 360.4 [MH]⁺.

Intermediate 188 6-[3-Fluoro-1-(propan-2-yl)piperidin-4-yl]-3,6-diazabicyclo[3.2.2]nonane

Intermediate 188 was prepared similarly to Intermediate 182, using Intermediate 187 instead of Intermediate 180, to give the title compound (44%) as a pale yellow gum. LCMS (ES⁺): 270.4 [MH]⁺.

Intermediate 189 tert-Butyl 4-{3-benzyl-3,6-diazabicyclo[3.2.2]nonan-6-yl}piperidine-1-carboxylate

Intermediate 189 was prepared similarly to Intermediate 186, using tert-butyl 4-oxopiperidine-1-carboxylate instead of 3-fluoro-4-oxo-piperidine-1-carboxylic acid tert-butyl ester, to give the crude title compound as a yellow liquid. LCMS (ES⁺): 400.3 [MH]⁺.

Intermediate 190 tert-Butyl 4-{3,6-diazabicyclo[3.2.2]nonan-6-yl}piperidine-1-carboxylate

Intermediate 189 (1.29 g, 3.24 mmol) was dissolved in MeOH (100 mL) and hydrogenated using an H-cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C. The solvents were removed in vacuo and the residue was purified by column chromatography to give the title compound (596 mg, 60%) as a yellow gum. LCMS (ES⁺): 310.3 [MH]⁺.

Intermediate 191 6-[6-(Piperidin-4-yl)-3,6-diazabicyclo[3.2.2]nonan-3-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 191 was prepared similarly to Intermediate 175, using Intermediate 190 instead of Intermediate 163, to give the crude title compound (42%) as a yellow liquid. LCMS (ES⁺): 407.2 [MH]⁺.

Intermediate 192 N-(Cyclopropylmethyl)-6-{3,10-diazabicyclo[4.3.1]decan-3-yl}pyridine-2-carboxamide

10-Benzyl-3,10-diaza-bicyclo[4.3.1]decane (785 mg, 3.41 mmol), Intermediate 174 (790 mg, 3.10 mmol), cesium carbonate (1.00 g, 3.04 mmol), palladium acetate (45.0 mg, 0.20 mmol) and BINAP (192 mg, 0.31 mmol) were suspended in dioxane (25 mL), degassed and heated at 95° C. for 18 h. The solvents were removed in vacuo, the residue was diluted with DCM, filtered and concentrated in vacuo. The residue was purified by column chromatography, dissolved in EtOH (20 mL) and hydrogenated using a hydrogen balloon at 50° C. over 10% Pd(OH)₂/C for 60 h. The reaction mixture was filtered through celite, washing with EtOH and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (89.0 mg, 49%).

Intermediate 193 6-{3,10-Diazabicyclo[4.3.1]decan-3-yl}-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 193 was prepared similarly to Intermediate 192, using Intermediate 39 instead of Intermediate 174, to give the crude title compound (28%) as a yellow gum. LCMS (ES⁺): 338.5 [MH]⁺.

Intermediate 194 6-Chloro-N-(cyclopropylmethyl)-3-methylpyridine-2-carboxamide

6-Chloro-3-methylpyridine-2-carboxylic acid (595 mg, 3.47 mmol), aminomethylcyclopropane (356 □L, 4.16 mmol), EDC.HCl (1.46 g, 7.63 mmol), HOBN (1.54 g, 8.67 mmol) and NEM (1.10 mL, 8.67 mmol) were dissolved in DCM (30 mL) and stirred for 16 h. The reaction mixture was washed with sat aq NaHCO₃ (30 mL), 1M aq HCl (30 mL), brine (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (215 mg, 28%) as a yellow solid. LCMS (ES⁺): 225.5 [MH]⁺.

Intermediate 195 N-(Cyclopropylmethyl)-6-(1,4-diazepan-1-yl)-3-methylpyridine-2-carboxamide

Intermediate 195 was prepared similarly to Intermediate 81, using Intermediate 194 instead of Intermediate 38, to give the crude title compound as a yellow liquid. LCMS (ES⁺): 289.2 [MH]⁺.

Intermediate 196 1-(1,3-Thiazol-2-yl)-1,4-diazepane

2-Bromothiazole (1.00 g, 6.10 mmol) and homopiperazine (2.44 g, 24.4 mmol) were dissolved in DMA (1 mL) and heated using a microwave (180° C., absorption high) for 30 min. The reaction mixture was dissolved in DCM (50 mL), washed with sat aq Na₂CO₃ (50 mL), brine (50 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (1.05 g, 94%) as a yellow solid. LCMS (ES⁺): 184.2 [MH]⁺.

Intermediate 197 6-[(1-Benzylpiperidin-4-yl)oxy]pyridine-2-carboxylic acid

Tert-butyl 6-chloropyridine-2-carboxylate (1.00 g, 4.68 mmol) and N-benzylpiperidin-4-ol (1.88 g, 9.83 mmol) were dissolved in dioxane (10 mL). NaH (393 mg, 60% dispersion in mineral oil, 9.83 mmol) was added and the reaction mixture was heated using a microwave (80° C., absorption high) for 1 h. The solvents were removed in vacuo and the residue was dissolved in MeOH (100 mL), filtered and concentrated in vacuo. The residue was purified by reverse phase column chromatography to give the title compound (860 mg, 59%) as a white solid. LCMS (ES⁺): 313.1 [MH]⁺.

Intermediate 198 6-[(1-Benzylpiperidin-4-yl)oxy]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 197 (430 mg, 1.38 mmol) was dissolved in DCM (20 mL) and oxalyl chloride (419 mg, 3.30 mmol) was added. The reaction mixture was stirred for 2 h, the solvents were removed in vacuo and the residue was dissolved in DCM (20 mL). DIPEA (711 mg, 5.51 mmol) and 4-aminopyridine (259 mg, 2.75 mmol) were added and the reaction mixture was stirred for 3 h. The reaction mixture was diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (75 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (360 mg, 67%) as a white solid. LCMS (ES⁺): 389.2 [MH]⁺.

Intermediate 199 6-(Piperidin-4-yloxy)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 198 (360 mg, 0.93 mmol) was dissolved in MeOH (30 mL) and the reaction mixture was hydrogenated using an H-Cube (80 bar, 60° C., 1.0 mL/min) over 10% Pd/C. The solvents were removed in vacuo to give the crude title compound (231 mg, 84%) as a white solid. LCMS (ES⁺): 299.2 [MH]⁺.

Intermediate 200 6-{[1-(Azepan-4-yl)piperidin-4-yl]oxy}-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 199 (77.0 mg, 0.26 mmol) was dissolved in DCM (6 mL) and N-Boc-hexahydro-1H-azepine-4-one (110 mg, 0.52 mmol) and NaBH(OAc)₃ (273 mg, 1.30 mmol) were added. The reaction mixture was stirred for 4 d, diluted with DCM (10 mL), washed with sat aq Na₂CO₃ (10 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (6 mL), TFA (3 mL) was added and the reaction mixture was stirred for 2 h. The reaction mixture was concentrated in vacuo, dissolved in DCM (10 mL), washed with sat aq Na₂CO₃ (10 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (102 mg, 100%) as a yellow liquid. LCMS (ES⁺): 396.2 [MH]⁺.

Intermediate 201 tert-Butyl 3-({6-[(pyridin-4-yl)carbamoyl]pyridin-2-yl}amino)piperidine-1-carboxylate

Intermediate 39 (250 mg, 1.07 mmol), 3-amino-piperidine-1-carboxylic acid tert-butyl ester (515 □L, 2.67 mmol) and DIPEA (746 □L, 4.28 mmol) were dissolved in NMP (2 mL) and heated using a microwave (185° C., absorption high) for 200 min. The reaction mixture was dissolved in DCM (20 mL), washed with sat aq NH₄Cl (10 mL×5), dried (MgSO₄) and concentrated in vacuo. The residue was partially purified by column to give the crude title compound as a brown oil. LCMS (ES⁺): 398.2 [MH]⁺.

Intermediate 202 tert-Butyl N-(1-{6-[(cyclopropylmethyl)carbamoyl]pyridin-2-yl}piperidin-4-yl)carbamate

Intermediate 202 was prepared similarly to Intermediate 201, using Intermediate 38 instead of Intermediate 39 and 4-N-(tert-butoxycarbonyl)aminopiperidine instead of 3-amino-piperidine-1-carboxylic acid tert-butyl ester, to give the title compound (584 mg, 99%) as a white solid. LCMS (ES⁺): 375.7 [MH]⁺.

Intermediate 203 6-(4-Aminopiperidin-1-yl)-N-(cyclopropylmethyl)pyridine-2-carboxamide

Intermediate 202 (584 mg, 1.56 mmol) was dissolved in MeOH (2 mL) and HCl (4 mL, 2M in Et₂O) was added. The reaction mixture was stirred for 16 h and the solvents were removed in vacuo to give the crude title compound (484 mg) as a light pink gum.

Intermediate 204 (3R)-1-[6-(5-Cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-amine

Intermediate 66 (2.00 g, 9.10 mmol), (R)-pyrrolidin-3-yl-carbamic acid tert-butyl ester (5.08 g, 27.3 mmol) and DIPEA (6.34 mL, 36.4 mmol) were dissolved in DMA (40 mL) and the reaction mixture was heated using a microwave (180° C., absorption high) for 2 h. The solvents were removed in vacuo and the residue dissolved in DCM (100 mL), washed with sat aq Na₂CO₃ (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography, dissolved in DCM (8 mL) and TFA (4 mL) was added. The reaction mixture was stirred for 4 h, the solvents were removed in vacuo and the residue was de-salted using a MP-TsOH SPE cartridge, eluting with 7 N ammonia in MeOH. The solvents were removed in vacuo to give the crude title compound (2.45 g) as a brown liquid. LCMS (ES⁺): 270.2 [MH]⁺.

Intermediate 205 tert-Butyl 4-{[(3R)-1-[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-yl]carbamoyl}piperidine-1-carboxylate

Intermediate 204 (400 mg, 1.49 mmol) and 1-(tert-butyoxycarbonyl)piperidine-4-carboxylic acid (341 mg, 1.49 mmol) were dissolved in DCM (5 mL) and DIPEA (0.65 mL, 3.71 mmol), EDC (346 mg, 2.23 mmol) and HONB (399 mg, 2.23 mmol) were added. The reaction mixture was stirred for 18 h and partitioned between DCM (50 mL) and sat aq Na₂CO₃ (30 mL). The aq fraction was extracted with DCM (2×20 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (241 mg, 34%) as a yellow liquid. LCMS (ES⁺): 481.1 [MH]⁺.

Intermediate 206 N-[(3R)-1-[6-(5-Cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-yl]-1-(propan-2-yl)piperidine-4-carboxamide

Intermediate 205 (241 mg, 0.50 mmol) was dissolved in DCM (6 mL), TFA (3 mL) was added and the reaction mixture was stirred for 3 h. The solvents were removed in vacuo and the residue was de-salted using a MP-TsOH SPE cartridge, eluting with 7 N ammonia in MeOH. The solvents were removed in vacuo and the residue was dissolved in DCM (10 mL). Acetone (0.33 mL, 4.51 mmol) and NaBH(OAc)₃ (1.06 g, 5.01 mmol) were added and the reaction mixture was stirred for 18 h and quenched with sat aq Na₂CO₃ (50 mL). DCM (50 mL) was added and the aq fraction was extracted with DCM (2×30 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (75.0 mg, 35%) as a yellow gum. LCMS (ES⁺): 423.2 [MH]⁺.

Intermediate 207 (3R)-1-[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-amine

Intermediate 207 was prepared similarly to Intermediate 204, using Intermediate 72 instead of Intermediate 66, to give the crude title compound as a brown liquid. LCMS (ES⁺): 284.3 [MH]⁺.

Intermediate 208 (3R)—N-[(3R)-1-[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-yl]pyrrolidine-3-carboxamide

(R)-Pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester (912 mg, 4.23 mmol), DIPEA (5.16 mL, 29.6 mmol), HBTU (1.61 g, 4.23 mmol) and Intermediate 207 (1.20 g, 4.23 mmol) were dissolved in DMF (10 mL) and stirred for 20 h. The reaction mixture was concentrated in vacuo, diluted with DCM (100 mL) and washed with sat aq Na₂CO₃ (50 mL). The aq fraction was extracted with DCM (2×100 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and dissolved in DCM (6 mL). TFA (3 mL) was added and the reaction mixture was stirred for 3 h. The reaction mixture was concentrated in vacuo and de-salted using an SCX cartridge, eluting with 7 N ammonia in MeOH. The reaction mixture was concentrated in vacuo to give the crude title compound (806 mg) as a brown solid. LCMS (ES⁺): 381.2 [MH]⁺.

Intermediate 209 (3S)—N-[(3R)-1-[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-yl]pyrrolidine-3-carboxamide

Intermediate 209 was prepared similarly to Intermediate 208, using (S)-pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester instead of (R)-pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester, to give the crude title compound as a brown liquid. LCMS (ES⁺): 381.2 [MH]⁺.

Intermediate 210 (3R)-1-Cyclopentyl-N-[(3R)-1-[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-yl]pyrrolidine-3-carboxamide

Intermediate 208 (269 mg, 0.71 mmol) was dissolved in DCM (10 mL), cyclopentanone (188 □L, 2.12 mmol) and NaBH(OAc)₃ (749 mg, 3.53 mmol) were added and the reaction mixture was stirred for 18 h. The reaction mixture was quenched with sat aq Na₂CO₃ (30 mL) and diluted with DCM (30 mL). The aq fraction was extracted with DCM (2×20 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (52.0 mg, 16%) as a white solid. LCMS (ES⁺): 449.1 [MH]⁺.

Intermediate 211 (3S)-1-Cyclopentyl-N-[(3R)-1-[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-yl]pyrrolidine-3-carboxamide

Intermediate 211 was prepared similarly to Intermediate 210, using Intermediate 209 instead of Intermediate 208, to give the title compound (68.0 mg, 24%) as a yellow gum. LCMS (ES⁺): 449.1 [MH]⁺.

Intermediate 212 6-[(3R)-3-Aminopyrrolidin-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 212 was prepared similarly to Intermediate 204, using Intermediate 39 instead of Intermediate 66, to give the crude title compound as a white solid. LCMS (ES⁺): 284.2 [MH]⁺.

Intermediate 213 N-(Pyridin-4-yl)-6-[(3R)-3-{[(3R)-pyrrolidin-3-ylmethyl]amino}pyrrolidin-1-yl]pyridine-2-carboxamide

Intermediate 212 (500 mg, 1.76 mmol) was dissolved in DCM (15 mL). Benzyl (3R)-3-formylpyrrolidine-1-carboxylate (412 mg, 1.76 mmol) and NaBH(OAc)₃ (411 mg, 1.94 mmol) were added and the reaction mixture was stirred overnight. The reaction mixture was diluted with DCM (10 mL), quenched with water (5 mL) and the organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and dissolved in MeOH (21 mL). The solution was hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C. The solvents were removed in vacuo to give the crude title compound (300 mg, 80%). LCMS (ES⁺): 367.3 [MH]⁺.

Intermediate 214 N-(Pyridin-4-yl)-6-[(3R)-3-{[(3S)-pyrrolidin-3-ylmethyl]amino}pyrrolidin-1-yl]pyridine-2-carboxamide

Intermediate 214 was prepared similarly to Intermediate 213, using benzyl (3S)-3-formylpyrrolidine-1-carboxylate instead of benzyl (3R)-3-formylpyrrolidine-1-carboxylate, to give the crude title compound as a yellow gum (93%). LCMS (ES⁺): 367.3 [MH]⁺.

Intermediate 215 6-[(3R)-3-[(Piperidin-4-ylmethyl)amino]pyrrolidin-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 212 (500 mg, 1.76 mmol) was dissolved in DCM (20 mL) and 4-formylpiperidine-1-carboxylic acid tert-butyl ester (376 mg, 1.76 mmol) and NaBH(OAc)₃ (748 mg, 3.52 mmol) were added. The reaction mixture was stirred at for 18 h, diluted with DCM (100 mL) and quenched with water (50 mL). The organic fraction was washed with sat aq Na₂CO₃ (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography, dissolved in DCM (40 mL) and TFA (10 mL) was added. The reaction mixture was stirred for 6 h and de-salted using a MP-TsOH SPE cartridge, eluting with 7 N ammonia in MeOH, to give the crude title compound as a yellow gum. LCMS (ES⁺): 381.2 [MH]⁺.

Intermediate 216 N-(2-Aminoethyl)-6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-amine

Intermediate 66 (770 mg, 3.51 mmol), ethylene diamine (1.17 mL, 17.5 mmol) and DIPEA (2.44 mL, 14.0 mmol) were dissolved in NMP (13 mL) and the reaction mixture was heated using a microwave (200-220° C., absorption high) for 80 min. Further ethylene diamine (1.17 mL, 17.5 mmol) was added and the reaction mixture was heated using a microwave (220° C., absorption high) for 50 min. The reaction mixture was diluted with DCM (20 mL), washed with sat aq Na₂CO₃ (20 mL), dried (MgSO₄) and concentrated in vacuo. The residue was partially purified by column chromatography to give the crude title compound (1.20 g) as a yellow gum. LCMS (ES⁺): 244.2 [MH]⁺.

Intermediates 217-223

Intermediates 217-223 were prepared similarly to Intermediate 216, by SNAr reaction of amines with 6-chloro-2-substituted pyridines; see Table 12 below.

TABLE 12 SNAr reactions of amines with 6-chloro-2-substituted pyridines

SMs/ LCMS Int Structure Yield (ES⁺) Intermediate Name 217

Int 63 94% 232.2 [MH]⁺ N-(2-Aminoethyl)-6-(5-ethyl- 1H-imidazol-2-yl)pyridin-2- amine 218

Int 72 95% 258.3 [MH]⁺ N-(2-Aminoethyl)-6-(5- cyclopropyl-4-methyl-1H- imidazol-2-yl)pyridin-2-amine 219

Int 39 Used crude 258.3 [MH]⁺ 6-[(2-Aminoethyl)amino]-N- (pyridin-4-yl)pyridine-2- carboxamide 220

Int 39 Used crude 286.4 [MH]⁺ 6-{Methyl[2- (methylamino)ethyl]amino}-N- (pyridin-4-yl)pyridine-2- carboxamide 221

Int 39 Used crude 272.4 [MH]⁺ 6-[(3-Aminopropyl)amino]-N- (pyridin-4-yl)pyridine-2- carboxamide 222

Int 39 78% 284.4 [MH]⁺ 6-(Piperazin-1-yl)-N-(pyridin-4- yl)pyridine-2-carboxamide 223

Int 72 64% 284.2 [MH]⁺ 1-[6-(5-Cyclopropyl-4-methyl- 1H-imidazol-2-yl)pyridin-2- yl]piperazine

Intermediate 224 tert-Butyl 3-[(2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)carbamoyl]pyrrolidine-1-carboxylate

Pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester (221 mg, 1.03 mmol), DIPEA (1.25 mL, 7.19 mmol), HBTU (390 mg, 1.03 mmol) and Intermediate 216 (250 mg, 1.03 mmol) were dissolved in DMF (10 mL) and stirred for 20 h. The solvents were removed in vacuo and the residue was diluted with DCM (20 mL) and washed with sat aq Na₂CO₃ (10 mL). The aq fraction was extracted with DCM (2×20 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (335 mg, 74%) as a yellow gum. LCMS (ES⁺): 441.1 [MH]⁺.

Intermediate 225 1-Cyclopentyl-N-(2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)pyrrolidine-3-carboxamide

Intermediate 224 (335 mg, 0.76 mmol) was dissolved in DCM (4 mL), TFA (1 mL) was added and the reaction mixture was stirred for 2 h. The solvents were removed in vacuo and the residue was partitioned between DCM (20 mL) and 1M aq NaOH (20 mL). The aq fraction was basified to pH 14 with NaOH and extracted with DCM (3×50 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. Half of the residue was dissolved in DCM (5 mL) and cyclopentanone (60.0 □L, 0.57 mmol) and NaBH(OAc)₃ (161 mg, 0.76 mmol) were added. The reaction mixture was stirred overnight, diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (150 mg) as a yellow oil. LCMS (ES⁺): 409.2 [MH]⁺.

Intermediate 226 (3R)—N-(2-{[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)pyrrolidine-3-carboxamide

Intermediate 226 was prepared similarly to Intermediate 208, using Intermediate 218 instead of Intermediate 207, to give the crude title compound as a yellow gum. LCMS (ES⁺): 355.2 [MH]⁺.

Intermediate 227 (3R)-1-Cyclopentyl-N-(2-{[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)pyrrolidine-3-carboxamide

Intermediate 227 was prepared similarly to Intermediate 210, using Intermediate 226 instead of Intermediate 208, to give the crude title compound (91%) as a yellow gum. LCMS (ES⁺): 423.2 [MH]⁺.

Intermediate 228 tert-Butyl 3-[(2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)amino]piperidine-1-carboxylate

Intermediate 216 (300 mg, 1.23 mmol) was dissolved in DCM (5 mL) and tert-butyl 3-oxopiperidine-1-carboxylate (270 mg, 1.36 mmol) and NaBH(OAc)₃ (523 mg, 2.47 mmol) were added. The reaction mixture was stirred overnight, diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (226 mg, 43%) as a yellow gum. LCMS (ES⁺): 427.1 [MH]⁺.

Intermediates 229-233

Intermediates 229-233 were prepared similarly to Intermediate 228, by reductive alkylation of Intermediates 216, 218 and 219; see Table 13 below.

TABLE 13 Reductive alkylation of Intermdiates 205, 207 and 208

SMs/ LCMS Int Structure Yield (ES⁺) Intermediate Name 229

Int 218 47% 441.2 [MH]⁺ tert-Butyl 3-[(2-{[6-(5- cyclopropyl-4-methyl-1H- imidazol-2-yl)pyridin-2- yl]amino}ethyl)amino] piperidine-1-carboxylate 230

Int 218 63% 441.2 [MH]⁺ tert-Butyl 4-[(2-{[6-(5- cyclopropyl-4-methyl-1H- imidazol-2-yl)pyridin-2- yl]amino}ethyl)amino] piperidine-1-carboxylate 231

Int 216 55% 413.1 [MH]⁺ tert-Butyl 3-[(2-{[6-(5- cyclopropyl-1H-imidazol- 2-yl)pyridin-2- yl]amino}ethyl)amino] pyrrolidine-1-carboxylate 232

Int 219 Used crude 455.2 [MH]⁺ tert-Butyl 4-{[2-({6- [(pyridin-4- yl)carbamoyl]pyridin-2- yl}amino)ethyl]amino} azepane-1-carboxylate 233

Int 218 64% 455.2 [MH]⁺ tert-Butyl 4-[(2-{[6-(5- cyclopropyl-4-methyl-1H- imidazol-2-yl)pyridin-2- yl]amino}ethyl)amino] azepane-1-carboxylate

Intermediate 234 tert-Butyl N-{2-[(2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)carbamoyl]ethyl}carbamate

Intermediate 234 was prepared similarly to Intermediate 224, using 3-tert-butoxycarbonylaminopropionic acid instead of pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester, to give the crude title compound (61%) as a yellow gum. LCMS (ES⁺): 415.1 [MH]⁺.

Intermediate 235 3-(Cyclopentylamino)-N-(2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)propanamide

Intermediate 235 was prepared similarly to Intermediate 225, using Intermediate 234 instead of Intermediate 224, to give the crude title compound (77%) as a pale yellow oil. LCMS (ES⁺): 383.2 [MH]⁺.

Intermediate 236 1-(Propan-2-yl)azepan-4-one

N-Boc-hexahydro-1H-azepine-4-one (3.00 g, 14.1 mmol) was dissolved in DCM (50 mL), TFA (15 mL) was added and the reaction mixture was stirred for 2 h. The solvents were removed in vacuo and the residue partitioned between DCM (500 mL) and sat aq Na₂CO₃ (500 mL). The aq fraction was extracted with DCM (2×250 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (50 mL) and acetone (10 mL) and NaBH(OAc)₃ (2.18 g, 141 mmol) were added. The reaction mixture was stirred for 18 h, diluted with DCM (200 mL) and quenched with sat aq Na₂CO₃ (150 mL). The organic fraction was dried (MgSO₄) and concentrated in vacuo to give the crude title compound (2.18 g) as a brown liquid. LCMS (ES⁺): 156.2 [MH]⁺.

Intermediate 237 tert-Butyl 4-(4-{6-[(pyridin-4-yl)carbamoyl]pyridin-2-yl}piperazin-1-yl)azepane-1-carboxylate

Intermediate 222 (1.88 g, 6.64 mmol) was dissolved in DCM (125 mL) and tert-butyl 4-oxoazepane-1-carboxylate (2.12 g, 9.95 mmol) and NaBH(OAc)₃ (7.03 g, 33.2 mmol) were added. The reaction mixture was stirred for 20 h, diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (75 mL), brine (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (100 mL), shaken with isocyanate resin (4 g) for 1.5 h, filtered and concentrated in vacuo. The residue was purified by reverse phase column chromatography to give the title compound (2.17 g, 68%) as a white solid. LCMS (ES⁺): 481.5 [MH]⁺.

Intermediate 238 Tetrakis(2,2,2-trifluoroacetic acid); 6-[4-(azepan-4-yl)piperazin-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 237 (1.88 g, 6.64 mmol) was dissolved in DCM (100 mL), TFA (15 mL) was added and the reaction mixture was stirred for 20 h. The solvents were removed in vacuo and the residue was purified reverse by phase column chromatography to give the title compound (3.94 g, 71%) as a dark red solid. LCMS (ES⁺): 381.5 [MH]⁺.

Intermediate 239 tert-Butyl 2-({4-[6-(butylcarbamoyl)pyridin-2-yl]-1,4-diazepan-1-yl}methyl)morpholine-4-carboxylate

Intermediate 82 (130 mg, 0.47 mmol) was dissolved in DCM (6 mL) and 2-formyl-morpholine-4-carboxylic acid tert-butyl ester (111 mg, 0.52 mmol) and NaBH(OAc)₃ (498 mg, 2.40 mmol) were added. The reaction mixture was stirred overnight. Further 2-formyl-morpholine-4-carboxylic acid tert-butyl ester (50.6 mg, 0.24 mmol) and NaBH(OAc)₃ (50.9 mg, 0.24 mmol) were added and the reaction mixture was stirred overnight. The reaction mixture was diluted with DCM (10 mL), quenched with water (5 mL) and the organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was partially purified by column chromatography to give the title compound as a yellow oil (156 mg, 70%). LCMS (ES⁺): 476.4 [MH]⁺.

Intermediate 240 tert-Butyl 4-{4-[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]piperazin-1-yl}azepane-1-carboxylate

Intermediate 240 was prepared similarly to Intermediate 237, using Intermediate 223 instead of Intermediate 222, to give the crude title compound (56%) as a pale yellow gum. LCMS (ES⁺): 481.3 [MH]⁺.

Intermediate 241 tert-Butyl 3-[2-(4-benzyl-1,4-diazepan-1-yl)-2-oxoethyl]morpholine-4-carboxylate

4-N-Boc-morpholine-3-acetic acid (500 mg, 2.04 mmol) and benzyl homopiperazine (388 mg, 2.04 mmol) were dissolved in DMF (20 mL) and cooled to 0° C. DIPEA (553 mg, 4.28 mmol) and HBTU (773 mg, 2.04 mmol) were added and the reaction mixture was stirred for 2 h. The solvents were removed in vacuo and the residue was partitioned between DCM (100 mL) and water (50 mL). The organic fraction was washed with 1 M aq Na₂CO₃ (25 mL), brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase column chromatography to give the title compound (730 mg, 86%) as a light yellow gum. LCMS (ES⁺): 418.4 [MH]⁺.

Intermediate 242 1-(4-Benzyl-1,4-diazepan-1-yl)-2-[4-(propan-2-yl)morpholin-3-yl]ethan-1-one

Intermediate 241 (730 mg, 1.75 mmol) was dissolved in DCM (20 mL) and TFA (2 mL) was added. The reaction mixture was stirred for 16 h and concentrated in vacuo. The residue was dissolved in DCM (20 mL) and acetone (1 mL) was added. The reaction mixture was stirred for 30 min, NaBH(OAc)₃ (1.11 g, 5.25 mmol) was added and the reaction mixture was stirred for 6 d. The reaction mixture was diluted with DCM (50 mL), washed with sat aq Na₂CO₃ solution (25 mL), brine (25 mL), dried (MgSO₄) and concentrated in vacuo to give the title compound (0.62 g, 99%) as a light yellow gum. LCMS (ES⁺): 360.5 [MH]⁺.

Intermediate 243 1-{2-[4-(Propan-2-yl)morpholin-3-yl]ethyl}-1,4-diazepane

Intermediate 242 (0.62 g, 1.73 mmol) was dissolved in THF (20 mL), LiAlH₄ (0.71 mL, 2.4 M THF, 1.70 mmol) was added and the reaction mixture was stirred for 16 h. The reaction mixture was quenched with brine (10 mL) and partitioned between DCM (50 mL) and water (20 mL). The aq fraction was extracted with DCM (2×20 mL) and the combined organic fractions were washed with brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C to give the title compound (0.42 g, 95%) as a yellow gum. LCMS (ES⁺): 256.5 [MH]⁺.

Intermediate 244 3-(1,2,3,4-Tetrahydroisoquinolin-2-yl)propyl methanesulfonate

3-Bromo-1-propanol (100 mg, 0.72 mmol), K₂CO₃ (249 mg, 1.80 mmol) and 1,2,3,4-tetrahydrisoquinoline (95.8 mg, 0.72 mmol) were dissolved in MeCN (2 mL) and the reaction mixture was heated at 60° C. for 18 h. The reaction mixture was filtered and concentrated in vacuo. The residue was dissolved in DCM (10 mL) and methanesulphonyl chloride (82.4 mg, 0.72 mmol) and Et₃N (87.4 mg, 0.86 mmol) were added. The reaction mixture was stirred for 1 h, diluted with DCM (20 mL), washed with sat aq NaHCO₃ (20 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (72.2 mg) as a colourless gum. LCMS (ES⁺): 270.3 [MH]⁺.

Intermediate 245 3-(3,3-Difluoropyrrolidin-1-yl)propyl methanesulfonate

Intermediate 245 was prepared similarly to Intermediate 244, using 3,3-difluoropyrrolidine hydrochloride instead of 1,2,3,4-tetrahydrisoquinoline, to give the title compound (150 mg, 86%) as a colourless gum. LCMS (ES⁺): 244.2 [MH]⁺.

Intermediate 246 6-[4-(3-Chloro-2-hydroxypropyl)-1,4-diazepan-1-yl]-N-(pyridin-3-ylmethyl)pyridine-2-carboxamide

Intermediate 87 (500 mg, 1.61 mmol) and NaHCO₃ (141 mg, 1.69 mmol) were suspended in EtOH (20 mL), epichlorohydrin (156 mg, 1.69 mmol) was added and the reaction mixture was stirred for 2 d. Further epichlorohydrin (78.0 mg, 0.85 mmol) was added and the reaction mixture was stirred for 3 d. The reaction mixture was concentrated in vacuo and purified by column chromatography to give the title compound (206 mg, 32%) as a white solid. LCMS (ES⁺): 404 [MH]⁺.

Intermediate 247 tert-Butyl 3-[(4-benzyl-1,4-diazepan-1-yl)carbonyl]-4-methylpiperazine-1-carboxylate

(S)-4-Boc-2-piperazinecarboxylic acid (530 mg, 2.17 mmol) was dissolved in MeOH (25 mL) and formaldehyde (1.76 mL, 37 wt % in water, 21.7 mmol) was added. The reaction mixture was stirred for 30 min, NaBH(OAc)₃ (0.92 g, 4.34 mmol) was added and the reaction mixture was stirred for 2 h. The solvents were removed in vacuo and the residue was purified by reverse phase column chromatography. The residue and benzyl homopiperazine (0.41 g, 2.17 mmol) were dissolved in DMF (20 mL) and cooled to 0° C. DIPEA (0.59 g, 4.56 mmol) and HBTU (0.82 g, 2.17 mmol) were added and the reaction mixture was stirred for 3 h. The solvents were removed in vacuo and the residue was partitioned between DCM (100 mL) and water (50 mL). The organic fraction was washed with 1M aq Na₂CO₃ (25 mL), brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase column chromatography to give the title compound (0.64 g, 71%) as a light yellow gum. LCMS (ES⁺): 417.4 [MH]⁺.

Intermediate 248 1-Benzyl-4-{[1-methyl-4-(propan-2-yl)piperazin-2-yl]carbonyl}-1,4-diazepane

Intermediate 247 (0.64 g, 1.54 mmol) was dissolved in DCM (20 mL), TFA (2 mL) was added and the reaction mixture was stirred for 16 h. The solvents were removed in vacuo and the residue was dissolved in DCM (20 mL) and acetone (1 mL) was added. The reaction mixture was stirred for 30 min and NaBH(OAc)₃ (0.98 g, 4.63 mmol) was added. The reaction mixture was stirred for 1.5 h, diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (25 mL), brine (25 mL), dried (MgSO₄) and concentrated in vacuo to give the title compound (0.46 g, 82%) as a light yellow gum. LCMS (ES⁺): 359.5 [MH]⁺.

Intermediate 249 1-{[1-Methyl-4-(propan-2-yl)piperazin-2-yl]methyl}-1,4-diazepane

Intermediate 248 (0.46 g, 1.27 mmol) was dissolved in THF (20 mL) and LiAlH₄ (0.54 mL, 2.4 M in THF, 1.27 mmol) was added. The reaction mixture was stirred for 16 h, quenched with brine (10 mL) and partitioned between DCM (50 mL) and water (20 mL). The aq fraction was extracted with DCM (2×20 mL) and the combined organic fractions were washed with brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was hydrogenated using an H-Cube (80 bar, 60° C., 1 mL/min) over 10% Pd/C to give the title compound (0.29 g, 89%) as a yellow gum. LCMS (ES⁺): 255.5 [MH]⁺.

Intermediate 250 tert-Butyl (2S)-2-(hydroxymethyl)morpholine-4-carboxylate

(S)—N-Boc-2-morpholine carboxylic acid (2.00 g, 8.65 mmol) was dissolved in THF (30 mL) and borane (25.9 mL, 1.0 M in THF, 25.9 mmol) was added dropwise. The reaction mixture was heated at reflux for 2.5 h and quenched with water (10 mL). The reaction mixture was concentrated in vacuo and the residue dissolved in DCM (30 mL), washed with sat aq Na₂CO₃ (2×20 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (1.74 g, 92%) as a pale yellow oil. LCMS (ES⁺): 240.3 [MNa]⁺.

Intermediate 251 tert-Butyl (2S)-2-(hydroxymethyl)morpholine-4-carboxylate

Intermediate 250 (500 mg, 2.30 mmol) and IBX (1.29 g, 4.60 mmol) were dissolved in DCE (20 mL) and heated at 70° C. for 18 h. The reaction mixture was filtered, washed with sat aq Na₂CO₃ (10 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (684 mg) as a pale yellow oil.

Intermediate 252 tert-Butyl (2R)-2-[(4-{6-[(pyridin-4-yl)carbamoyl]pyridin-2-yl}-1,4-diazepan-1-yl)methyl]morpholine-4-carboxylate

Intermediate 83 (150 mg, 0.50 mmol) was dissolved in DCM (6 mL) and Intermediate 251 (119 mg, 0.55 mmol) and NaBH(OAc)₃ (535 mg, 2.52 mmol) were added. The reaction mixture was stirred overnight. Further Intermediate 251 (52.7 mg, 0.25 mmol) and NaBH(OAc)₃ (51.9 mg, 0.25 mmol) were added and the reaction mixture was stirred for 2 h. The reaction mixture was diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound as a yellow oil (211 mg, 84% yield).

Intermediate 253 N-(Cyclopropylmethyl)-6-{4-[3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)propyl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 81 (150 mg, 0.55 mmol), N-(3-bromopropyl)-phthalimide (147 mg, 0.55 mmol) and K₂CO₃ (113 mg, 0.82 mmol) were dissolved in MeCN (2 mL) and the reaction mixture was stirred at 60° C. for 12 h. The reaction mixture was filtered, washed with DCM, stirred with isocyanate resin for 2 h, filtered and concentrated in vacuo to give the title compound (240 mg, 95%) as a pale yellow gum. LCMS (ES⁺): 462.8 [MH]⁺.

Intermediate 254 1-(Pyridin-2-yl)-1,4-diazepane

2-Chloropyridine (3.00 g, 26.4 mmol), DIPEA (9.20 mL, 52.8 mmol) and homopiperazine (7.90 g, 79.3 mmol) were dissolved in DMA (10 mL) and heated using a microwave (180-200° C., absorption high) for 40 min. The reaction mixture was diluted with DCM (150 mL), washed with sat aq Na₂CO₃ (100 mL), brine (100 mL), dried (MgSO₄) and concentrated in vacuo to give the title compound (3.41 g, 72%) as a brown liquid. LCMS (ES⁺): 178.6 [MH]⁺.

Intermediates 255-257

Intermediates 255-257 were prepared similarly to Intermediate 254, by SNAr reaction of 2-chloropyridines with homopiperazine; see Table 14 below.

TABLE 14 SNAr reactions of 2-chloropyridines

LCMS Intermediate Int Structure Yield (ES⁺) Name 255

— 192.5 [MH]⁺ 1-(6-Methyl- pyridin-2-yl)- 1,4-diazepane 256

— 192.5 [MH]⁺ 1-(5-Methyl- pyridin-2-yl)- 1,4-diazepane 257

— 192.5 [MH]⁺ 1-(4-Methyl- pyridin-2-yl)- 1,4-diazepane

Intermediate 258 1-(Piperidin-4-yl)-4-(pyridin-2-yl)-1,4-diazepane

Intermediate 254 (400 mg, 2.26 mmol) was dissolved in DCM (5 mL) and Boc-Piperidone (540 mg, 2.71 mmol) and NaBH(OAc)₃ (2.39 g, 11.3 mmol) were added. The reaction mixture was stirred for 18 h, diluted with DCM (20 mL) and quenched with water (15 mL). The organic fraction was washed with sat aq Na₂CO₃ (10 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (2 mL), TFA (1 mL) was added and the reaction mixture was stirred for 3 h. The solvents were removed in vacuo and the residue dissolved in DCM (10 mL), washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo to give the crude title compound (361 mg, 61%) as a yellow solid. LCMS (ES⁺): 261.7 [MH]⁺.

Intermediates 259-261

Intermediates 259-261 were prepared similarly to Intermediate 258, by reductive alkylation and deprotection of Intermediates 255-257; see Table 15 below.

TABLE 15 Preparation of 4-(piperidin-4-yl)-1,4-diazepan-1-yl] pyridine intermediates

Int/ LCMS Int Structure Yield (ES⁺) Intermediate Name 259

Int 255 77% 275.7 [MH]⁺ 1-(6-Methylpyridin-2-yl)- 4-(piperidin-4-yl)-1,4- diazepane 260

Int 256 41% 275.7 [MH]⁺ 1-(5-Methylpyridin-2-yl)- 4-(piperidin-4-yl)-1,4- diazepane 261

Int 257 43% 275.8 [MH]⁺ 1-(4-Methylpyridin-2-yl)- 4-(piperidin-4-yl)-1,4- diazepane

Intermediate 262 tert-Butyl 4-{1-[(2-chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepane-1-carboxylate

Intermediate 25 (10.0 g, 44.7 mmol) and Boc-homopiperazine (9.85 g 49.2 mmol) were dissolved in DCM (250 mL) and NaBH(OAc)₃ (47.4 g, 224 mmol) was added portionwise. The reaction mixture was stirred for 18 h and quenched with water (200 mL). The organic fraction was washed with 1M aq Na₂CO₃ (200 mL), brine (100 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (11.0 g, 60%) as a colourless liquid. LCMS (ES⁺): 408.7 [MH]⁺.

Intermediate 263 1-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepane

Intermediate 262 (11.0 g, 27.0 mmol) was dissolved in DCM (100 mL), TFA (10.0 mL, 135 mmol) was added and the reaction mixture was stirred for 16 h. The solvents were removed in vacuo and the residue was partitioned between DCM (200 mL) and water (200 mL). The aq fraction was basified to pH 14 with NaOH, extracted with DCM (3×100 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo to give the title compound (7.42 g, 89%) as a pale yellow liquid. LCMS (ES⁺): 308.7 [MH]⁺.

Intermediate 264 2-Bromo-N-(cyclopropylmethyl)-1,3-thiazole-4-carboxamide

2-Bromothiazole-4-carboxylic acid (500 mg, 2.40 mmol), aminomethylcyclopropane (247 □L, 2.88 mmol), EDC.HCl (1.01 g, 5.29 mmol), HOBN (1.08 g, 6.01 mmol) and NEM (765 □L, 6.01 mmol) were dissolved in DCM (30 mL) and the reaction mixture was stirred for 16 h. The organic fraction was washed with sat aq NaHCO₃ (30 mL), 1 M aq HCl (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (404 mg, 64%) as a white solid. LCMS (ES⁺): 261.4 [MH]⁺.

Intermediate 265 2-Chloro-N-[3-(1H-imidazol-1-yl)propyl]-6-methylpyrimidine-4-carboxamide

Intermediate 265 was prepared similarly to Intermediate 264, using 2-chloro-4-methylpyrimidine-5-carboxylic acid instead of 2-bromothiazole-4-carboxylic acid and 1-(3-aminopropyl)imidazole instead of aminomethylcyclopropane, to give the crude title compound. LCMS (ES⁺): 280.5 [MH]⁺.

Intermediate 266 6-Chloro-N-(cyclopropylmethyl)-4-methylpyridine-2-carboxamide

6-Chloro-4-methylpyridine-2-carboxylic acid (422 mg, 2.46 mmol) was dissolved in DCM (10 mL) and oxalyl chloride (422 □L, 4.92 mmol) and DMF (100 □L) were added. The reaction mixture was stirred for 3 h, the solvents were removed in vacuo and the residue was azeotroped with DCM. The residue was dissolved in DCM (10 mL), DIPEA (1.63 mL, 9.84 mmol) and aminomethylcyclopropane (427 □L, 4.92 mmol) were added and the reaction mixture was stirred for 1 h. The reaction mixture was diluted with DCM (40 mL), washed with sat aq NaHCO₃ (50 mL), 1 M aq HCl (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography to give the title compound (494 mg, 69%) as a yellow liquid. LCMS (ES⁺): 225.5 [MH]⁺.

Intermediate 267 2-Chloro-N-(cyclopropylmethyl)pyridine-4-carboxamide

Intermediate 267 was prepared similarly to Intermediate 264, using 2-chloroisonicotinic acid instead of 2-bromothiazole-4-carboxylic acid, to give the title compound (58%) as a pale yellow solid. LCMS (ES⁺): 211.5 [MH]⁺.

Intermediate 268 N-(Cyclopropylmethyl)-2-(1,4-diazepan-1-yl)pyridine-4-carboxamide

Intermediate 268 was prepared similarly to Intermediate 81, using Intermediate 267 instead of Intermediate 38, to give the crude title compound as a yellow liquid. LCMS (ES⁺): 275.7 [MH]⁺.

Intermediate 269 N-(Cyclopropylmethyl)-2-[4-(piperidin-4-yl)-1,4-diazepan-1-yl]pyridine-4-carboxamide

Intermediate 269 was prepared similarly to Intermediate 119, using Intermediate 268 instead of Intermediate 81, to give the title compound (37%) as a yellow liquid. LCMS (ES⁺): 358.7 [MH]⁺.

Intermediate 270 6-Chloro-N-(cyclopropylmethyl)-5-methoxypyridine-2-carboxamide

Intermediate 270 was prepared similarly to Intermediate 264, using 6-chloro-5-methoxypyridine-2-carboxylic acid instead of 2-bromothiazole-4-carboxylic acid, to give the title compound (75%) as a colourless liquid. LCMS (ES⁺): 241.5 [MH]⁺.

Intermediate 271 N-(Cyclopropylmethyl)-6-(1,4-diazepan-1-yl)-5-methoxypyridine-2-carboxamide

Intermediate 271 was prepared similarly to Intermediate 81, using Intermediate 270 instead of Intermediate 38, to give the crude title compound as a yellow liquid. LCMS (ES⁺): 305.7 [MH]⁺.

Intermediate 272 N-(Cyclopropylmethyl)-5-methoxy-6-[4-(piperidin-4-yl)-1,4-diazepan-1-yl]pyridine-2-carboxamide

Intermediate 272 was prepared similarly to Intermediate 119, using Intermediate 271 instead of Intermediate 81, to give the title compound (24%) as a yellow liquid. LCMS (ES⁺): 388.7 [MH]⁺.

Intermediate 273 6-[4-(piperidin-4-yl)-7,7-dihydrogenio-1,4-diazepan-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 273 was prepared similarly to Intermediate 176, using tert-butyl 4-oxopiperidine-1-carboxylate instead of tert-butyl 3-fluoro-4-oxopiperidine-1-carboxylate, to give the crude title compound (100%) as a yellow liquid. LCMS (ES⁺): 383.5 [MH]⁺.

Intermediate 274 tert-Butyl N-(1-{6-[(pyridin-4-yl)carbamoyl]pyridin-2-yl}piperidin-4-yl)carbamate

Intermediate 274 was prepared similarly to Intermediate 201, using 4-N-(tert-butoxycarbonyl)aminopiperidine instead of 3-amino-piperidine-1-carboxylic acid tert-butyl ester, to give the crude title compound as a white solid. LCMS (ES⁺): 398.4 [MH]⁺.

Example 1 General Procedure A N-(Oxan-4-ylmethyl)-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 135 (75.0 mg, 0.22 mmol), EDC.HCl (91.3 mg, 0.48 mmol), HONB (97.0 mg, 0.54 mmol) and NEM (275 □L, 2.16 mmol) were dissolved in DCM (1 mL). 4-Aminomethyltetrahydropyran (125 mg, 1.08 mmol) was added and the reaction mixture was stirred for 18 h. The reaction mixture was diluted with DCM (20 mL) and the organic fraction was washed with sat aq Na₂CO₃ (20 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (31.4 mg, 33%) as a colourless gum. HRMS (ESI⁺) calculated for C₂₅H₄₁N₅O₂: 443.326026, found 443.326896. HPLC: Rf 3.70 min, 100% purity.

Example 2 General Procedure B N-(Oxan-4-yl)-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 135 (650 mg, 1.88 mmol), 4-aminotetrahydropyran (210 mg, 2.07 mmol), DIPEA (970 mg, 7.52 mmol) and HBTU (710 mg, 1.88 mmol) were dissolved in DMF (10 mL) and the reaction mixture was stirred for 20 h. The solvents were removed in vacuo and the residue was diluted with DCM (100 mL), washed with sat aq Na₂CO₃ (10 mL), dried (MgSO₄) and the solvents were removed in vacuo. The residue was purified by reverse phase HPLC and de-salted (K₂CO₃ in DCM) to give the title compound (300 mg, 38%) as a colourless gum. HRMS (ESI+) calculated for C24H39N5O2: 429.310376, found 429.311726. HPLC: Rf 3.61 min, 100% purity.

Example 3 N-[3-(1H-Imidazol-1-yl)propyl]-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 135.3TFA (217 mg, 0.32 mmol) was dissolved in DCM (3 mL), oxalyl chloride (232 □L, 2.70 mmol) and DMF (100 □L) were added and the reaction mixture was stirred for 5 h. The solvents were removed in vacuo and the residue was dissolved in DCM (3 mL). DIPEA (446 □L, 2.70 mmol) and 1-(3-aminopropyl)imidazole (129 □L, 1.08 mmol) were added and the reaction mixture was stirred for 2.5 d. DCM (30 mL) was added and the reaction mixture was washed with sat aq Na₂CO₃ (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC and column chromatography to give the title compound (7.16 mg, 6%) as a yellow gum. HRMS (ESI+) calculated for C₂₅H₃₉N₇O: 453.321609, found 453.320079. HPLC: Rf 3.92 min, 100% purity.

Examples 4-58

Examples 4-58 were prepared similarly to Examples 1-2, by reacting Intermediates 135 and 136 with the appropriate amine; see Table 16 below.

TABLE 16 Preparation of amides from Intermediates 135 and 136

Int/ Proc/ HRMS (ESI⁺), Ex Structure Name Yield HPLC 4

N-Ethyl-6-{4- [1-(propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide Int 135 B 28% HRMS (ESI+) calculated for C21H35N5O: 373.284161, found 373.285491. HPLC: Rf 3.53 min, 98.8% purity. 5

6-{4-[1-(Propan- 2-yl)piperidin-4- yl]-1,4-diazepan- 1-yl}-N- propylpyridine- 2-carboxamide Int 135 B 19% HRMS (ESI+) calculated for C22H37N5O: 387.299811, found 387.300111. HPLC: Rf 3.77 min, 99.4% purity. 6

N-(2-Methyl- propyl)-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 A 23% HRMS (ESI+) calculated for C23H39N5O: 401.315461, found 401.316091. HPLC: Rf 4.03 min, 100% purity. 7

N-Butyl-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B 46% HRMS (ESI+) calculated for C23H39N5O: 401.315461, found 401.316951. HPLC: Rf 4.05 min, 98.7% purity. 8

N-(2-Fluoro- ethyl)-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 A 28% HRMS (ESI+) calculated for C21H34FN5O: 391.274739, found 391.276459. HPLC: Rf 3.51 min, 100% purity. 9

N-(2,2- Difluoroethyl)- 6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide Int 135 B 45% HRMS (ESI+) calculated for C21H33F2N5O: 409.265317, found 409.267177. HPLC: Rf 3.72 min, 100% purity. 10

6-{4-[1- (Propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}-N-(2,2,2- trifluoroethyl) pyridine-2- carboxamide Int 135 A 42% HRMS (ESI+) calculated for C21H32F3N5O: 427.255895, found 427.256005. HPLC: Rf 4.07 min, 100% purity. 11

N-Cyclopropyl- 6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide Int 135 B 34% HRMS (ESI+) calculated for C22H35N5O: 385.284161, found 385.285131. HPLC: Rf 3.58 min, 99.2% purity. 12

N-(2-Hydroxy- ethyl)-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B 26% HRMS (ESI+) calculated for C21H35N5O2: 389.279075, found 389.280655. HPLC: Rf 3.22 min, 100% purity. 13

N-(2-Cyano- ethyl)-6-{4- [1-(propan-2- yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B 18% HRMS (ESI+) calculated for C22H34N6O: 398.27941, found 398.28101. HPLC: Rf 3.50 min, 100% purity. 14

N-(2- Methoxy- ethyl)-6-{4- [1-(propan-2- yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 A 11% HRMS (ESI+) calculated for C22H37N5O2: 403.294725, found 403.295825. HPLC: Rf 3.48 min, 100% purity. 15

N-(3- Methoxy- propyl)-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B  5% HRMS (ESI+) calculated for C23H39N5O2: 417.310376, found 417.310116. HPLC: Rf 3.63 min, 100% purity. 16

N-[2- (Dimethyl- amino)ethyl]- 6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide Int 135 B  8% HRMS (ESI+) calculated for C23H40N6O: 416.32636, found 416.32511. HPLC: Rf 3.06 min, 99.2% purity. 17

N-Methyl-N- (2-methyl- propyl)-6-{4- [1-(propan-2- yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B 10% HRMS (ESI+) calculated for C24H41N5O: 415.331111, found 415.330691. HPLC: Rf 4.06 min, 100% purity. 18

N-[(3S)- Oxolan-3-yl]- 6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridine- 2-carboxamide Int 135 B 26% HRMS (ESI+) calculated for C23H37N5O2: 415.294725, found 415.296125. HPLC: Rf 3.51 min, 100% purity. 19

N-[(3R)- Oxolan-3-yl]- 6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide Int 135 B 22% HRMS (ESI+) calculated for C23H37N5O2: 415.294725, found 415.295925. HPLC: Rf 3.50 min, 100% purity. 20

N-[(2R)- Oxolan-2-yl- methyl]-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 A 32% HRMS (ESI+) calculated for C24H39N5O2: 429.310376, found 429.311996. HPLC: Rf 3.69 min, 100% purity. 21

1-[(6-{4-[1- (Propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridin-2- yl)carbonyl]- 2,3-dihydro- 1H-indole Int 135 B 18% HRMS (ESI+) calculated for C27H37N5O: 447.299811, found 447.301341. HPLC: Rf 4.35 min, 99.2% purity. 22

2-[(6-{4-[1- (Propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridin-2- yl)carbonyl]- 1,2,3,4-tetra- hydroiso- quinoline Int 135 B 13% HRMS (ESI+) calculated for C28H39N5O: 461.315461, found 461.317701. HPLC: Rf 4.39 min, 100% purity. 23

N-Phenyl-6- {4-[1-(propan- 2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B 34% HRMS (ESI+) calculated for C25H35N5O: 421.284161, found 421.285491. HPLC: Rf 4.38 min, 100% purity. 24

N-(2- Hydroxy- phenyl)-6-{4- [1-(propan-2- yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B  3% HRMS (ESI+) calculated for C25H35N5O2: 437.279075, found 437.280385. HPLC: Rf 4.27 min, 98.9% purity. 25

N-(4-Chloro- phenyl)-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B 22% HRMS (ESI+) calculated for C25H34ClN5O: 455.245188, found 455.245978. HPLC: Rf 4.81 min, 100% purity. 26

N-(4-Methoxy- phenyl)-6-{4- [1-(propan-2- yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B  3% HRMS (ESI+) calculated for C26H37N5O2: 451.294725, found 451.296235. HPLC: Rf 4.32 min, 99.7% purity. 27

N-(4-Methyl- phenyl)-6-{4- [1-(propan-2- yl)piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B  4% HRMS (ESI+) calculated for C26H37N5O: 435.299811, found 435.301201. HPLC: Rf 4.58 min, 99.7% purity. 28

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1- yl}-N- (pyridin-2-yl) pyridine-2- carboxamide Int 135 B 11% HRMS (ESI+) calculated for C24H34N6O: 422.27941, found 422.28007. HPLC: Rf 3.89 min, 100% purity. 29

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(pyridin-3- yl)pyridine-2- carboxamide Int 135 B 11% HRMS (ESI+) calculated for C24H34N6O: 422.27941, found 422.28131. HPLC: Rf 3.31 min, 99.7% purity. 30

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(pyridin-4- yl)pyridine-2- carboxamide Int 135 B  2% HRMS (ESI+) calculated for C24H34N6O: 422.27941, found 422.27983. HPLC: Rf 3.18 min, 100% purity. 31

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(1,3- thiazol-2-yl) pyridine-2- carboxamide Int 135 B 13% HRMS (ESI+) calculated for C22H32N6OS: 428.23583, found 428.23724. HPLC: Rf 4.15 min, 99.3% purity. 32

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(1,3- thiazol-5-yl) pyridine-2- carboxamide Int 135 B 79% HRMS (ESI+) calculated for C22H32N6OS; 429.24311, found 429.24149. HPLC: Rf 3.89 min, 100% purity. 33

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(pyridin-2- ylmethyl) pyridine-2- carboxamide Int 135 B 14% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29685. HPLC: Rf 3.18 min, 99.6% purity. 34

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(pyridin-3- ylmethyl) pyridine-2- carboxamide Int 135 B 36% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29575. HPLC: Rf 3.16 min, 99.7% purity. 35

N-Methyl-6- {4-[1-(Propan- 2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl}- N-(pyridin-3- ylmethyl) pyridine-2- carboxamide Int 135 B 24% HRMS (ESI+) calculated for C26H38N6O: 450.31071, found 450.31217. HPLC: Rf 3.07 min, 98.7% purity. 36

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(pyridin-4- ylmethyl) pyridine-2- carboxamide Int 135 B  6% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29701. HPLC: Rf 3.14 min, 100% purity. 37

N-[(1-Methyl- 1H-imidazol- 2-yl)methyl]- 6-{4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- Int 135 A 29% HRMS (ESI+) calculated for C24H37N7O: 439.305959, found 439.306099. HPLC: Rf 3.16 min, 100% purity. carboxamide 38

N-(1,3- Oxazol-2- ylmethyl)-6- {4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- Int 135 A 26% HRMS (ESI+) calculated for C23H34N6O2: 426.274324, found 426.275144. HPLC: Rf 3.55 min, 100% purity. carboxamide 39

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} N-(1,3-thiazol- 2-ylmethyl) pyridine-2- carboxamide Int 135 B 34% HRMS (ESI+) calculated for C23H34N6OS: 442.25148, found 442.2535. HPLC: Rf 3.70 min, 100% purity. 40

N-(Furan-2- ylmethyl)-6- {4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide Int 135 B  7% HRMS (ESI+) calculated for C24H35N5O2: 425.279075, found 425.280715. HPLC: Rf 3.92 min, 100% purity. 41

N-(1,3- Oxazol-4- ylmethyl)-6- {4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- Int 135 B 26% HRMS (ESI+) calculated for C23H34N6O2: 426.274324, found 426.272804. HPLC: Rf 3.51 min, 100% purity. carboxamide 42

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(1,3- thiazol-4- ylmethyl) pyridine-2- Int 135 B 12% HRMS (ESI+) calculated for C23H34N6OS: 442.25148, found 442.25304. HPLC: Rf 3.61 min, 100% purity. carboxamide 43

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(1,3- thiazol-5- ylmethyl) pyridine-2- Int 135 B 10% HRMS (ESI+) calculated for C23H34N6OS: 442.25148, found 442.25317. HPLC: Rf 3.24 min, 98.2% purity. carboxamide 44

N-(1,3- Oxazol-5- ylmethyl)-6- {4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- Int 135 B 12% HRMS (ESI+) calculated for C23H34N6O2: 426.274324, found 426.275794. HPLC: Rf 3.19 min, 99.4% purity. carboxamide 45

N-[2-(1H- Imidazol-1- yl)ethyl]-6- {4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2- Int 135 A 24% HRMS (ESI+) calculated for C24H37N7O: 439.305959, found 439.306109. HPLC: Rf 3.14 min, 100% purity. carboxamide 46

6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-[2-(pyridin- 2-yl)ethyl] pyridine-2- carboxamide Int 135 B 12% HRMS (ESI+) calculated for C26H38N6O: 450.31071, found 450.3113. HPLC: Rf 3.19 min, 100% purity. 47

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(oxan-4- ylmethyl) pyridine-2- carboxamide Int 136 A 47% HRMS (ESI+) calculated for C29H40 ClN5O2: 525.287053, found 525.284223. HPLC: Rf 3.96 min, 100% purity. 48

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(2,2,2- trifluoro- ethyl) Int 136 A 50% HRMS (ESI+) calculated for C25H31 ClF3N5O: 509.216923, found 509.218693. HPLC: Rf 4.40 min, pyridine-2- 99.6% purity. carboxamide 49

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(3-methyl- butyl) pyridine-2- Int 136 A 56% HRMS (ESI+) calculated for C28H40 ClN5O: 497.292139, found 497.290299. HPLC: Rf 4.66 min, carboxamide 99.3% purity. 50

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1- yl)-N-(2- methoxy- ethyl) Int 136 A 56% HRMS (ESI+) calculated for C26H36 ClN5O2: 485.255753, found 485.253443. HPLC: Rf 3.94 min, pyridine-2- 100% purity. carboxamide 51

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1- yl)-N- [(2R)- oxolan-2-yl- methyl] pyridine-2- Int 136 A 48% HRMS (ESI+) calculated for C28H38 ClN5O2: 511.271403, found 511.270223. HPLC: Rf 3.87 min, 99.5% purity. carboxamide 52

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(oxan-4-yl) pyridine-2- carboxamide Int 136 A 43% HRMS (ESI+) calculated for C28H38 ClN5O2; 512.27868, found 512.2796. HPLC: Rf 3.82 min, 100% purity. 53

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(oxan-4-yl) pyridine-2- carboxamide Int 136 A 53% HRMS (ESI+) calculated for C28H33 ClN6O; 505.24771, found 505.2475. HPLC: Rf 3.61 min, 99.3% purity. 54

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(pyridine- 4-yl)pyridine- 2-carboxamide Int 136 A  8% HRMS (ESI+) calculated for C28H33 ClN6O: 504.240437, found 504.241067. HPLC: Rf 3.67 min, 100% purity. 55

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(pyridine- 3-ylmethyl) pyridine-2- carboxamide Int 136 A 38% HRMS (ESI+) calculated for C29H35 ClN6O: 518.256087, found 518.254667. HPLC: Rf 3.49 min, 99.5% purity. 56

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(pyridine- 4-ylmethyl) pyridine-2- carboxamide Int 136 A 39% HRMS (ESI+) calculated for C29H35 ClN6O: 519.26336, found 519.26306. HPLC: Rf 3.39 min, 99.4% purity. 57

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(1,3-oxazol- 2-ylmethyl) pyridine-2- carboxamide Int 136 A 29% HRMS (ESI+) calculated for C27H33 ClN6O2: 508.235352, found 508.23531. HPLC: Rf 3.85 min, 99.2% purity. 58

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(1,3-oxazol- 4-ylmethyl) pyridine-2- carboxamide Int 136 A 48% HRMS (ESI+) calculated for C27H33 ClN6O2: 508.235352, found 508.235412. HPLC: Rf 3.91 min, 99.0% purity.

Example 59 N-(Cyclopropylmethyl)-6-{4-[1-(1,3-difluoropropan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 81 (100 mg, 0.36 mmol) and Intermediate 7 (64.6 mg, 0.36 mmol) were dissolved in DCM (10 mL) and NaBH(OAc)₃ (386 mg, 1.82 mmol) was added. The reaction mixture was stirred for 4 d, diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (40 mL), brine (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (2.80 mg, 2%) as a colourless gum. HRMS (ESI+) calculated for C23H35F2N5O: 435.280967, found 435.280897. HPLC: Rf 3.86 min, 100% purity.

Examples 60-124

Examples 60-124 were prepared similarly to Examples 59, by reacting Intermediates 81-88, 90-115 and 117 with the appropriate piperidin-4-one derivative; see Table 17 below.

TABLE 17 Reductive alkylations of Intermediates 81-88, 90-115 and 117

HRMS (ESI⁺), Ex Structure Name Ints Yield HPLC 60

N-(Cyclopropyl- methyl)-6-[4-(1- ethylpiperidin- 4-yl)-1,4- diazepan-1-yl] pyridine-2- carboxamide  81, * 31% HRMS (ESI+) calculated for C22H35N5O: 385.284161, found 385.284971. HPLC: Rf 3.87 min, 99.5% purity. 61

N-(Cyclopropyl- methyl)-6-[4-(1- propylpiperidin- 4-yl)-1,4- diazepan-1-yl] pyridine-2- carboxamide  81, * 30% HRMS (ESI+) calculated for C23H37N5O: 399.299811, found 399.299541. HPLC: Rf 3.93 min, 100% purity. 62

N-(Cyclopropyl- methyl)-6-[4-(1- cyclopropyl- piperidin- 4-yl)-1,4- diazepan-1-yl] pyridine-2- carboxamide  81, * 40% HRMS (ESI+) calculated for C23H35N5O: 397.284161, found 397.284451. HPLC: Rf 3.89 min, 99.8% purity. 63

N-(Cyclopropyl- methyl)-6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, * 36% HRMS (ESI+) calculated for C23H37N5O: 399.299811, found 399.300391. HPLC: Rf 3.90 min, 99.4% purity. 64

6-[4-(1-tert- Butylpiperidin- 4-yl)-1,4- diazepan-1-yl]- N-(cyclo- propylmethyl) pyridine-2- carboxamide  81, * 14% HRMS (ESI+) calculated for C24H39N5O: 413.315461, found 413.315521. HPLC: Rf 3.90 min, 96.1% purity. 65

6-{4-[1- (Butan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}- N-(cyclo- propylmethyl) pyridine-2- carboxamide  81, 22 25% HRMS (ESI+) calculated for C24H39N5O: 413.315461, found 413.315641. HPLC: Rf 4.05 min, 99.7% purity. 66

N-(Cyclopropyl- methyl)-6-{4-[1- (pentan-3-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, 23 36% HRMS (ESI+) calculated for C25H41N5O: 427.331111, found 427.331491. HPLC: Rf 4.13 min, 100% purity. 67

N-(Cyclopropyl- methyl)-6-{4-[1- (1-fluoro- propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, 10  9% HRMS (ESI+) calculated for C23H36 FN5O: 417.290389, found 417.291219. HPLC: Rf 3.59 min, 100% purity. 68

N-(Cyclopropyl- methyl)-6-{4-[1- (1,1-difluoro- propan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, 11 21% HRMS (ESI+) calculated for C23H35 F2N5O: 435.280967, found 435.282337. HPLC: Rf 3.99 min, 100% purity. 69

N-(Cyclopropyl- methyl)-6-(4- {1-[(2S)-1,1,1- trifluoro- propan-2-yl] piperidin-4-yl}- 1,4-diazepan-1- yl)pyridine-2- carboxamide  81, 12  5% HRMS (ESI+) calculated for C23H34 F3N5O: 453.271545, found 453.273405. HPLC: Rf 5.16 min, 99.2% purity. 70

N-(Cyclopropyl- methyl)-6-{4- [1-(4,4,4- trifluoro- butan-2-yl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, 15  9% HRMS (ESI+) calculated for C24H36 F3N5O: 467.287195, found 467.288465. HPLC: Rf 4.13 min, 100% purity. 71

N-(Cyclopropyl- methyl)-6-{4- [1-(2- methoxyethyl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, 21 17% HRMS (ESI+) calculated for C23H37 N5O2: 415.294725, found 415.296525. HPLC: Rf 3.85 min, 100% purity. 72

6-[4-(1-Cyclo- pentylpiperidin- 4-yl)-1,4- diazepan-1-yl]- N-(cyclo- propylmethyl) pyridine-2- carboxamide  81, 24  6% HRMS (ESI+) calculated for C25H39N5O: 425.315461, found 425.315921. HPLC: Rf 4.07 min, 100% purity. 73

N-(Cyclopropyl- methyl)-6-{4- [1-(2-fluoro- cyclopentyl) piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- carboxamide  81, 16  4% HRMS (ESI+) calculated for C25H38 FN5O: 443.306039, found 443.304639. HPLC: Rf 3.87 min, 100% purity (gradient 20-100%). 74

N-(Cyclopropyl- methyl)-6-(4- {1-[(1R)-1- phenylethyl] piperidin-4-yl}- 1,4-diazepan-1- yl)pyridine-2- carboxamide  81, 17  5% HRMS (ESI+) calculated for C28H39N5O: 461.315461, found 461.316741. HPLC: Rf 4.03 min, 100% purity (gradient 20-100%). 75

N-(Cyclopropyl- methyl)-6-(4- {1-[(1R)-1-(4- fluorophenyl) ethyl] piperidin-4-yl}- 1,4-diazepan-1- yl)pyridine-2- carboxamide  81, 18  7% HRMS (ESI+) calculated for C28H38 FN5O: 479.306039, found 479.306619. HPLC: Rf 3.96 min, 100% purity. 76

N-(Cyclopropyl- methyl)-6-(4- {1-[(1R)-2,3- dihydro-1H- inden-1-yl] piperidin-4-yl}- 1,4-diazepan-1- yl)pyridine-2- carboxamide  81, 19 10% HRMS (ESI+) calculated for C29H39N5O: 473.315461, found 473.316401. HPLC: Rf 4.29 min, 99.6% purity. 77

N-(Cyclopropyl- methyl)-6-(4- {1-[(1S)-2,3- dihydro-1H- inden-1-yl] piperidin-4-yl}- 1,4-diazepan-1- yl)pyridine-2- carboxamide  81, 20  5% HRMS (ESI+) calculated for C29H39N5O: 473.315461, found 473.314341. HPLC: Rf 4.12 min, 100% purity. 78

6-(4-{1-[(2R)- Butan-2-yl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(pyridine-4- yl)pyridine-2- carboxamide  83, 8 20% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29509. HPLC: Rf 3.56 min, 100% purity. 79

6-(4-{1-[(2S)- Butan-2-yl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(pyridine-4- yl)pyridine-2- carboxamide  83, 9 15% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29628. HPLC: Rf 3.57 min, 100% purity. 80

6-[4-(1-tert- Butylpiperidin- 4-yl)-1,4- diazepan-1-yl]- N-(pyridine-4- yl)pyridine-2- carboxamide  83, * 17% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29503. HPLC: Rf 3.50 min, 100% purity. 81

N-(Pyridin-4- yl)-6-(4-{1- [(2R)-1,1,1- trifluoro- propan-2-yl] piperidin-4- yl}-1,4- diazepan-1-yl) pyridine-2-  83, 13  1% HRMS (ESI+) calculated for C24H31 F3N6O: 476.251144, found 476.253024. HPLC: Rf 4.15 min, carboxamide 98.3% purity. 82

N-(Pyridin-4- yl)-6-(4-{1- [(2S)-1,1,1- trifluoro- propan-2-yl] piperidin-4- yl}-1,4- diazepan-1-yl) pyridine-2-  83, 12 11% HRMS (ESI+) calculated for C24H31 F3N6O: 476.251144, found 476.251594. HPLC: Rf 4.36 min, carboxamide 100% purity. 83

6-[4-(1-Cyclo- pentylpiperidin- 4-yl)-1,4- diazepan-1-yl]- N-(pyridine-4- yl)pyridine-2- carboxamide  83, 24  2% HRMS (ESI+) calculated for C26H36N6O: 448.29506, found 448.29628. HPLC: Rf 3.61 min, 100% purity. 84

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(2-methyl- pyridine-4- yl)pyridine-2- carboxamide  84, 25 13% HRMS (ESI+) calculated for C29H35 ClN6O: 518.256087, found 518.257537. HPLC: Rf 3.74 min, 100% purity. 85

6-(4-{1-[(2- Chlorophenyl) methyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(2,6- dimethyl- pyridin-4-yl) pyridine-2- carboxamide  86, 25 13% HRMS (ESI+) calculated for C30H37 ClN6O: 532.271738, found 532.272528. HPLC: Rf 3.81 min, 100% purity. 86

N-(2-Methyl- pyridin-4-yl)-6- {4-[1-(propan- 2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide  84, *  8% HRMS (ESI+) calculated for C25H36N6O: 437.30234, found 437.30215. HPLC: Rf 4.44 min, 100% purity. 87

N-(2,6- Dimethyl- pyridin-4-yl)-6- {4-[1-(propan- 2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide  86, * 30% HRMS (ESI+) calculated for C26H38N6O: 451.31799, found 451.31717. HPLC: Rf 4.68 min, 99.8% purity. 88

N-(3-Methyl- pyridin-4-yl)-6- {4-[1-(propan- 2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2- carboxamide  85, * 89% HRMS (ESI+) calculated for C25H36N6O: 437.30234, found 437.30194. HPLC: Rf 4.37 min, 100% purity. 89

N-(Pyridin-3- ylmethyl)- 6-(4-{1-[(2S)- 1,1,1-trifluoro- propan-2-yl] piperidin-4- yl}-1,4- diazepan-1-yl) pyridine-2-  87, 12 14% HRMS (ESI+) calculated for C25H33 F3N6O: 490.266794, found 490.268534. HPLC: Rf 3.98 min, carboxamide 97.4% purity. 90

N-(Pyridin-3- ylmethyl)- 6-{4-[1- (4,4,4-trifluoro- butan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl} pyridine-2-  87, 15 23% HRMS (ESI+) calculated for C26H35 F3N6O: 504.282444, found 504.284294. HPLC: Rf 3.39 min, carboxamide 99.4% purity. 91

N-(Pyridin-3- ylmethyl)- 6-{4-[1- (1,1,1-trifluoro- 2-methyl- propan-2-yl) piperidin-4- yl]-1,4- diazepan-1-yl}  87, 14 10% HRMS (ESI+) calculated for C26H35 F3N6O: 504.282444, found 504.283234. HPLC: Rf 3.88 min, pyridine-2- 98.7% purity carboxamide (gradient 20-100%). 92

6-(4-{1-[(1R)- 1-Phenylethyl] piperidin-4- yl}-1,4- diazepan-1-yl)- N-(pyridine- 3-ylmethyl) pyridine-2- carboxamide  87, 17  5% HRMS (ESI+) calculated for C30H38N6O: 498.31071, found 498.312128. HPLC: Rf 3.34 min, 99.2% purity (gradient 20-100%). 93

N-Butyl-6-(4- {1-[(2S)-1,1,1- trifluoro- propan- 2-yl]piperidin- 4-yl}-1,4- diazepan-1-yl) pyridine-2- carboxamide  82, 12 46% HRMS (ESI+) calculated for C23H36 F3N5O: 455.287195, found 455.288705. HPLC: Rf 5.45 min, 99.1% purity. 94

N-(1,3- Thiazol-2- ylmethyl)- 6-(4-{1- [(2S)-1,1,1- trifluoropropan- 2-yl]piperidin- 4-yl}-1,4- diazepan-1-yl) pyridine-2- carboxamide  88, 12  9% HRMS (ESI+) calculated for C23H31 F3N6OS: 496.223215, found 496.225335. HPLC: Rf 4.92 min, 100% purity. 95

1-Methyl-2-(6- {4-[1-(propan- 2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl} pyridine-2-yl)- 1H-indole  90, *  8% HRMS (ESI+) calculated for C27H37N5; 432.31217, found 432.31149. HPLC: Rf 5.11 min, 100% purity. 96

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-(6- {1H-pyrrolo [3,2-b]pyridine- 2-yl}pyridine- 2-yl)-1,4- diazepane  91, *  8% HRMS (ESI+) calculated for C25H34N6: 418.284495, found 418.285865. HPLC: Rf 3.60 min, 100% purity. 97

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-(6- {1H-pyrrolo [3,2-c]pyridine- 2-yl}pyridine- 2-yl)-1,4- diazepane  92, *  1% HRMS (ESI+) calculated for C25H34N6; 419.29177, found 419.29028. HPLC: Rf 3.64 min, 99.1% purity 98

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-(6- {1H-pyrrolo [2,3-c]pyridine- 2-yl}pyridine- 2-yl)-1,4- diazepane  93, *  1% HRMS (ESI+) calculated for C25H34N6; 419.29177, found 419.29202. HPLC: Rf 3.79 min, 99.2% purity 99

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-(6- {1H-pyrrolo [2,3-b]pyridine- 2-yl}pyridine- 2-yl)-1,4- diazepane  94, *  9% HRMS (ESI+) calculated for C25H34N6: 418.284495, found 418.286015. HPLC: Rf 3.98 min, 98.8% purity 100

2-(6-{4-[1- (Propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridine- 2-yl)-1H- indole  95, *  6% HRMS (ESI+) calculated for C26H35N5: 417.289246, found 417.290196. HPLC: Rf 4.93 min, 100% purity. 101

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-(6- {1H-pyrrolo [2,3-b]pyridine- 3-yl}pyridine- 2-yl)-1,4- diazepane  96, * 14% HRMS (ESI+) calculated for C25H34N6: 418.284495, found 418.286275. HPLC: Rf 3.57 min, 99.7% purity. 102

3-(6-{4-[1- (Propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridine- 2-yl)-1H- indole  97, *  2% HRMS (ESI+) calculated for C26H35N5: 417.289246, found 417.289786. HPLC: Rf 3.67 min, 100% purity. 103

2-(6-{4-[1- (Propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridine- 2-yl)-1H- indole-6- carbonitrile  98, *  2% HRMS (ESI+) calculated for C27H34N6; 443.29177, found 443.29233. HPLC: Rf 5.10 min, 98.4% purity. 104

6-Methoxy- 2-(6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridine- 2-yl)-1H- indole  99, *  9% HRMS (ESI+) calculated for C27H37N5O; 448.30709, found 448.30676. HPLC: Rf 5.04 min, 100% purity. 105

5-Methoxy- 2-(6-{4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepan- 1-yl}pyridine- 2-yl)-1H- indole 100, *  4% HRMS (ESI+) calculated for C27H37N5O: 447.299811, found 447.299691. HPLC: Rf 4.72 min, 100% purity. 106

1-(6-{3H- Imidazo[4,5-c] pyridin-2-yl} pyridin-2-yl)- 4-[1-(propan- 2-yl) piperidin-4- yl]-1,4- diazepane 102, * 15% LCMS (ES⁺): 420.0 [MH]⁺. HPLC: Rf 3.37 min, 100% purity. 107

1-[6-(4- Methyl-1H- imidazol-2- yl)pyridine- 2-yl]-4-[1- (propan-2- yl)piperidin- 4-yl]-1,4- diazepane 101, *  3% HRMS (ESI+) calculated for C22H34N6; 383.29177, found 383.29163. HPLC: Rf 3.36 min, 98.7% purity. 108

1-[6-(4- Ethyl-1H- imidazol-2- yl)pyridine- 2-yl]-4-[1- (propan-2- yl)piperidin- 4-yl]-1,4- diazepane 103, * 31% HRMS (ESI+) calculated for C23H36N6: 396.300145, found 396.300705. HPLC: Rf 3.41 min, 99.4% purity. 109

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-[6- (4-propyl-1H- imidazol-2-yl) pyridine-2- yl]-1,4- diazepane 104, * 10% HRMS (ESI+) calculated for C24H38N6; 411.32307, found 411.32318. HPLC: Rf 3.76 min, 99.4% purity. 110

1-{6-[4- (Propan-2-yl)- 1H-imidazol- 2-yl]pyridine- 2-yl}-4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepane 105, * 12% HRMS (ESI+) calculated for C24H38N6; 411.32307, found 411.32324. HPLC: Rf 3.72 min, 98.9% purity. 111

1-[6-(4- Cyclopropyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepane 106, * 17% HRMS (ESI+) calculated for C24H36N6; 409.30742, found 409.30743. HPLC: Rf 3.61 min, 98.7% purity. 112

1-[1-(Propan- 2-yl)piperidin- 4-yl]-4-{6- [4-(trifluoro- methyl)-1H- imidazol-2-yl] pyridine-2- yl}-1,4- diazepane 107, *  4% HRMS (ESI+) calculated for C22H31 F3N6: 436.25623, found 436.25566. HPLC: Rf 4.32 min, 97.2% purity. 113

1-[6-(4- tert-Butyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepane 108, * 14% HRMS (ESI+) calculated for C25H40N6: 424.331445, found 424.330735. HPLC: Rf 5.28 min, 98.0% purity (gradient 5-50%). 114

1-[6-(4- Phenyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4-yl]- 1,4-diazepane 109, * 28% HRMS (ESI+) calculated for C27H36N6: 444.300145, found 444.300585. HPLC: Rf 3.97 min, 98.3% purity. 115

1-[6-(4- Ethyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-{1- [(2S)-1,1,1- trifluoro- propan-2-yl] piperidin-4- 103, 12  8% HRMS (ESI+) calculated for C23H33 F3N6: 450.27188, found 450.27393. HPLC: Rf 4.42 min, yl}-1,4- 99.7% purity. diazepane 116

1-{1-[(2R)- Butan-2-yl] piperidin-4- yl}-4-[6-(4- ethyl-1H- imidazol-2- yl)pyridine- 2-yl]-1,4- diazepane 103, 8 22% HRMS (ESI+) calculated for C24H38N6; 411.32307, found 411.32349. HPLC: Rf 3.65 min, 100% purity. 117

1-[6-(4- tert-Butyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-(1- tert-butyl- piperidin-4- yl)-1,4- diazepane 108, * 22% HRMS (ESI+) calculated for C26H42N6: 438.347095, found 438.348015. HPLC: Rf 3.91 min, 97.1% purity 118

1-[6-(4,5- Dimethyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepane 110, * 12% HRMS (ESI+) calculated for C23H36N6; 397.30742, found 397.30603. HPLC: Rf 3.51 min, 100% purity. 119

1-[6-(5- Ethyl-4- methyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepane 111, * 14% HRMS (ESI+) calculated for C24H38N6; 411.32307, found 411.32303. HPLC: Rf 3.69 min, 96.9% purity. 120

1-[6-(4,5- Diethyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepane 112, *  6% HRMS (ESI+) calculated for C25H40N6: 425.33872, found 425.3381. HPLC: Rf 3.93 min, 96.8% purity. 121

1-[6-(4-Cyclo- propyl-5- methyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepane 113, *  8% HRMS (ESI+) calculated for C25H38N6: 423.32307, found 423.32352. HPLC: Rf 3.79 min, 98.3% purity. 122

1-[6-(4-Cyclo- propyl-5- ethyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepane 114, * 11% HRMS (ESI+) calculated for C26H40N6: 437.33872, found 437.33795. HPLC: Rf 4.00 min, 99.1% purity. 123

1-[6-(5- Methyl-4- propyl- 1H-imidazol- 2-yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- diazepane 115, *  9% HRMS (ESI+) calculated for C25H40N6; 425.33872, found 425.33743. HPLC: Rf 3.95 min, 100% purity. 124

1-[6-(4- Ethyl-1- methyl-1H- imidazol-2- yl)pyridine- 2-yl]-4-[1- (propan-2-yl) piperidin-4- yl]-1,4- 117, * 35% HRMS (ESI+) calculated for C24H38N6; 411.32307, found 411.32251. HPLC: Rf 3.47 min, 99.6% purity. diazepane * Intermediate commercially available

Example 125 N-(Cyclopropylmethyl)-3-methyl-6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Example 125 was prepared similarly to Example 63, using Intermediate 195 instead of Intermediate 81, to give the title compound (12%) as a yellow gum. HRMS (ESI+) calculated for C24H39N5O: 413.315461, found 413.315661. HPLC: Rf 4.01 min, 98.7% purity.

Example 126 1-[1-(2,3-Dihydro-1H-inden-1-yl)piperidin-4-yl]-4-(1,3-thiazol-2-yl)-1,4-diazepane

Intermediate 196 (150 mg, 0.82 mmol) and racemic Intermediate 19 (176 mg, 0.82 mmol) were dissolved in DCM (15 mL) and NaBH(OAc)₃ (867 mg, 4.09 mmol) was added. The reaction mixture was stirred for 18 h, diluted with DCM (25 mL), washed with sat aq Na₂CO₃ (30 mL), brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (64.1 mg, 21%) as a white solid. HRMS (ESI+) calculated for C22H30N4S: 382.219118, found 382.220358. HPLC: Rf 3.45 min, 98.9% purity.

Example 127 N-(Cyclopropylmethyl)-6-{4-[1-(1-methoxypropan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 119 (90.0 mg, 0.25 mmol) and methoxyacetone (22.2 mg, 0.25 mmol) were dissolved in DCM (7 mL) and NaBH(OAc)₃ (267 mg, 1.25 mmol) was added. The reaction mixture was stirred for 3 d, diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (30 mL), brine (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC and de-salted (K₂CO₃ in DCM) to give the title compound (13.4 mg, 12%) as a light yellow gum. HRMS (ESI+) calculated for C24H39N5O2: 429.310376, found 429.311516. HPLC: Rf 3.94 min, 99.1% purity.

Examples 128-139

Examples 128-139 were prepared similarly to Example 127, by reacting Intermediates 119-123 with the appropriate aldehyde or ketone; see Table 18 below.

TABLE 18 Reductive alkylations of Intermediates 119-123

SM/ Ex Structure Name Yield HRMS (ESI⁺), HPLC 128

N-(Cyclopropylmethyl)-6-{4-[1- (oxolan-3-yl)piperidin-4-yl]-1,4- diazepan-1-yl}pyridine-2- carboxamide Int 119 12% HRMS (ESI+) calculated for C24H37N5O2: 427.294725, found 427.295685. HPLC: Rf 3.76 min, 99.1% purity. 129

6-[4-(1-Benzylpiperidin-4-yl)-1,4- diazepan-1-yl]-N-(cyclopropyl methyl)pyridine-2-carboxamide Int 119 23% HRMS (ESI+) calculated for C27H37N5O: 447.299811, found 447.301461. HPLC: Rf 4.23 min, 97.3% purity. 130

N-(Cyclopropylmethyl)-6-(4-{1-[(4- fluorophenyl)methyl]piperidin-4-yl}- 1,4-diazepan-1-yl)pyridine-2- carboxamide Int 119 25% HRMS (ESI+) calculated for C27H36FN5O: 465.290389, found 465.291239. HPLC: Rf 4.29 min, 96.9% purity. 131

N-(Cyclopropylmethyl)-6-(4-{1-[(2- methylphenyl)methyl]piperidin-4- yl}-1,4-diazepan-1-yl)pyridine-2- carboxamide Int 119 25% HRMS (ESI+) calculated for C28H39N5O: 461.315461, found 461.317091. HPLC: Rf 4.32 min, 98.6% purity. 132

6-(4-{1-[(2-Chlorophenyl)methyl] piperidin-4-yl}-1,4-diazepan-1-yl)- N-(cyclopropylmethyl)pyridine-2- carboxamide Int 119 59% HRMS (ESI+) calculated for C27H36ClN5O: 481.260839, found 481.262229. HPLC: Rf 5.14 min, 98.4% purity. 133

N-(Cyclopropylmethyl)-6-(4-{1-[(2- methoxyphenyl)methyl]piperidin-4- yl}-1,4-diazepan-1-yl)pyridine-2- carboxamide Int 119 45% HRMS (ESI+) calculated for C28H39N5O2: 477.310376, found 477.311266. HPLC: Rf 4.31 min, 97.8% purity. 134

6-(4-{1-[(3-Chlorophenyl)methyl] piperidin-4-yl}-1,4-diazepan-1-yl)- N-(cyclopropylmethyl)pyridine-2- carboxamide Int 119 34% HRMS (ESI+) calculated for C27H36ClN5O: 481.260839, found 481.262369. HPLC: Rf 4.45 min, 97.6% purity. 135

6-(4-{1-[(2-Chloro-4-fluorophenyl) methyl]pyridin-4-yl}-1,4-diazepan-1- yl)-N-(cyclopropylmethyl)pyridine- 2-carboxamide Int 119 39% HRMS (ESI+) calculated for C27H35ClFN5O: 499.251417, found 499.253217. HPLC: Rf 4.38 min, 97.2% purity. 136

6-(4-{1-[(2-Chlorophenyl)methyl] piperidin-4-yl}-1,4-diazpan-1- yl)pyridine-2-carboxamide Int 120 20% HRMS (ESI+) calculated for C23H30ClN5O: 427.213888, found 427.214648. HPLC: Rf 3.72 min, 100% purity. 137

6-(4-{1-[(2-Chlorophenyl)methyl] piperidin-4-yl}-1,4-diazepan-1-yl)- N-ethylpyridine-2-carboxamide Int 121  1% HRMS (ESI+) calculated for C25H34ClN5O: 455.245188, found 455.247018. HPLC: Rf 3.99 min, 99.1% purity. 138

N-Butyl-6-(4-{1-[(2- chlorophenyl)methyl]piperidin-4- yl}-1,4-diazepan-1-yl)pyridine-2- carboxamide Int 122  7% HRMS (ESI+) calculated for C27H38ClN5O: 483.276489, found 483.277239. HPLC: Rf 4.44 min, 99.8% purity. 139

6-(4-{1-[(2-Chlorophenyl)methyl] piperidin-4-yl}-1,4-diazepan-1-yl)-N- [3-(1H-imidazol-1-yl)propyl] pyridine-2-carboxamide Int 123 43% HRMS (ESI+) calculated for C29H38ClN7O: 535.282637, found 535.284117. HPLC: Rf 3.61 min, 97.5% purity.

Example 140 1-Methyl-2-(6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridin-2-yl)-1H-1,3-benzodiazole

Intermediate 135 (200 mg, 0.58 mmol), EDC.HCl (167 mg, 0.87 mmol), HONB (156 mg, 0.87 mmol), N-methyl-1,2-phenylenediamine (177 mg, 1.45 mmol) and DIPEA (144 mL, 0.87 mmol) were dissolved in DCM (4 mL) and stirred at 45° C. in a sealed tube overnight. The reaction mixture was diluted with DCM (20 mL), washed with sat aq NaHCO₃ (25 mL), brine (25 mL) and concentrated in vacuo. The residue was purified by column chromatography, dissolved in acetic acid (2 mL) and heated using a microwave (150° C., absorption high) for 30 min. The solvents were removed in vacuo and the residue dissolved in DCM (25 mL), washed with sat aq NaHCO₃ (25 mL), brine (25 mL) and concentrated in vacuo. The product was purified by reverse phase HPLC to give the title compound (44.3 mg, 18%) as a colourless gum. HRMS (ESI+) calculated for C26H36N6; 433.30742, found 433.30667. HPLC: Rf 3.66 min, 100% purity.

Examples 141-152

Examples 141-152 were prepared similarly to Example 140, by reacting Intermediate 135 with the appropriate aniline; see Table 19 below.

TABLE 19 Amide formation and cyclisation with Intermediate 135

HRMS Ex Structure Name Reagent Yield (ESI⁺), HPLC 141

2-(6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4-diazepan- 1-yl}pyridine-2-yl)- 1H-1,3- benzodiazole

24% HRMS (ESI+) calculated for C25H34N6: 418.284495, found 418.286455. HPLC: Rf 4.36 min, 99.6% purity. 142

7-Fluoro-2- (6-{4-[1-(propan-2- yl)piperidin- 4-yl]-1,4- diazepan-1- yl}pyridine-2- yl)-1H-1,3- benzodiazole

 2% HRMS (ESI+) calculated for C25H33FN6; 437.28235, found 437.28098. HPLC: Rf 3.94 min, 100% purity. 143

7-Methyl-2- (6-{4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepan-1- yl}pyridine-2-yl)- 1H-1,3- benzodiazole

 7% HRMS (ESI+) calculated for C26H36N6; 433.30742, found 433.30569. HPLC: Rf 3.91 min, 100% purity. 144

2-(6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4-diazepan- 1-yl}pyridine-2-yl)- 6-(trifluoro- methyl)-1H-1,3-

 5% HRMS (ESI+) calculated for C26H33F3N6; 487.27916, found 487.27872. HPLC: Rf 4.50 benzodiazole min, 98.3% purity. 145

5,6-Difluoro- 2-(6-{4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepan-1- yl}pyridine-2-yl)-1,3- benzodiazole

 6% HRMS (ESI+) calculated for C25H32F2N6; 455.27293, found 455.27115. HPLC: Rf 4.12 min, 100% purity. 146

5,6-Dimethyl-2- (6-{4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepan-1- yl}pyridine-2- yl)-1H-1,3- benzodiazole

 2% HRMS (ESI+) calculated for C27H38N6; 447.32307, found 447.32205. HPLC: Rf 4.17 min, 100% purity. 147

6-Fluoro-2- (6-{4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepan-1- yl}pyridine-2-yl)- 1H-1,3- benzodiazole

 4% HRMS (ESI+) calculated for C25H33FN6; 437.28235, found 437.28287. HPLC: Rf 3.86 min, 99.2% purity. 148

6-Methyl-2- (6-{4-[1-(propan-2- yl)piperidin-4-yl]- 1,4-diazepan-1- yl}pyridine-2- yl)-1H-1,3- benzodiazole

 6% HRMS (ESI+) calculated for C26H36N6; 433.30742, found 433.3064. HPLC: Rf 3.97 min, 99.4% purity. 149

2-(6-{4-[1- (Propan-2-yl) piperidin-4- yl]-1,4-diazepan- 1-yl}pyridine-2-yl)- 1H-1,3-benzo- diazole-6-carbonitrile

 7% HRMS (ESI+) calculated for C26H33N7; 444.28702, found 444.2869. HPLC: Rf 4.13 min, 99.1% purity. 150

6-Methoxy-2- (6-{4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepan-1- yl}pyridine- 2-yl)-1H-1,3- benzodiazole

 4% HRMS (ESI+) calculated for C26H36N6O; 449.30234, found 449.30258. HPLC: Rf 3.91 min, 100% purity. 151

2-(6-{4-[1- (Propan-2- yl)piperidin- 4-yl]-1,4-diazepan- 1-yl}pyridine-2-yl)- 1,3-benzothiazole

17% HRMS (ESI+) calculated for C25H33N5S: 435.245667, found 435.247347. HPLC: Rf 6.21 min, 98.7% purity. 152

2-(6-{4-[1- (Propan-2- yl)piperidin-4- yl]-1,4-diazepan- 1-yl}pyridine-2-yl)- 1,3-benzoxazole

20% HRMS (ESI+) calculated for C25H33N5O: 419.268511, found 419.269101. HPLC Rf 4.43 min, 100% purity.

Example 153 1-[6-(5-Methyl-1,2,4-oxadiazol-3-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 137 (125 mg, 0.35 mmol) and DIPEA (108 mg, 0.83 mmol) were dissolved in DCM (10 mL), acetyl chloride (28.6 mg, 0.36 mmol) was added and the reaction mixture was stirred for 16 h. The reaction mixture was partitioned between DCM (75 mL) and sat aq Na₂CO₃ (25 mL) and the organic fraction was separated and washed with brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was suspended in MeCN (2 mL) and xylenes (5 mL) and heated to 150° C. for 3 h. The solvents were removed in vacuo and the residue was purified by reverse phase HPLC to give the title compound (10.0 mg, 11%) as a yellow gum. HRMS (ESI+) calculated for C₂₁H₃₂N₆O: 384.26376, found 384.26221. HPLC: Rf 3.64 min, 98.5% purity.

Example 154 1-{1-[(2R)-Butan-2-yl]piperidin-4-yl}-4-[6-(5-propyl-1,2,4-oxadiazol-3-yl)pyridin-2-yl]-1,4-diazepane

Example 154 was prepared similarly to Example 153, using Intermediate 138 instead of Intermediate 137 and butanoyl chloride instead of acetyl chloride, to give the title compound (8%) as a yellow gum. HRMS (ESI+) calculated for C₂₄H₃₈N₆O; 427.31799, found 427.31772. HPLC: Rf 4.60 min, 100% purity.

Examples 155-167

Examples 155-167 were prepared similarly to Example 153, by reacting Intermediate 137 with the appropriate acyl chloride; see Table 20 below.

TABLE 20 Synthesis of 1,2,4-oxadiazoles from Intermediate 137

HRMS Ex Structure Name Reagent Yield (ESI⁺), HPLC 155

1-[6-(5-Ethyl- 1,2,4-oxadiazol-3-yl) pyridine-2-yl]- 4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane trihydrochloride

 2% HRMS (ESI+) calculated for C22H34N6O: 398.27941, found 398.27911. HPLC: Rf 3.98 min, 98.7% purity. 156

1-[1-(Propan-2- yl)piperidin-4-yl]-4-[6- (5-propyl-1,2,4- oxadiazol-3-yl)pyridine- 2-yl]-1,4-diazepane

10% HRMS (ESI+) calculated for C23H36N6O: 412.29506, found 412.2952. HPLC: Rf 4.22 min, 97.8% purity. 157

1-[6-(5-Butyl- 1,2,4-oxadiazol-3- yl)pyridine-2- yl]-4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane

 8% HRMS (ESI+) calculated for C24H38N6O; 427.31799, found 427.31738. HPLC: Rf 4.80 min, 100% purity. 158

1-{6-[5-(Propan-2- yl)-1,2,4-oxadiazol- 3-yl]pyridine-2- yl}-4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane

 9% HRMS (ESI+) calculated for C23H36N6O; 413.30234, found 413.30133. HPLC: Rf 4.44 min, 99.6% purity. 159

1-[6-(5-tert-Butyl- 1,2,4-oxadiazol-3- yl)pyridine-2- yl]-4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane

11% HRMS (ESI+) calculated for C24H38N6O; 427.31799, found 427.31732. HPLC: Rf 4.69 min, 99.3% purity. 160

1-{6-[5-(2,2- Dimethylpropyl)- 1,2,4-oxa diazol-3-yl]pyridine- 2-yl}-4-[1-(propan- 2-yl)piperidin-4- yl]-1,4-diazepane

 7% HRMS (ESI+) calculated for C25H40N6O; 441.33364, found 441.33356. HPLC: Rf 4.93 min, 98.4% purity. 161

1-[6-(5-Cyclopropyl- 1,2,4-oxadiazol-3- yl)pyridine-2-yl]- 4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane

10% HRMS (ESI+) calculated for C23H34N6O: 410.27941, found 410.28114. HPLC: Rf 4.14 min, 100% purity. 162

1-[6-(5-Cyclopentyl- 1,2,4-oxadiazol-3- yl)pyridine-2- yl]-4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane

13% HRMS (ESI+) calculated for C25H38N6O; 439.31799, found 439.31766. HPLC: Rf 4.84 min, 100% purity. 163

1-{6-[5-(Methoxy- methyl)-1,2,4-oxa diazol-3-yl]pyridine- 2-yl}-4-[1-(propan- 2-yl)piperidin-4- yl]-1,4-diazepane

 9% HRMS (ESI+) calculated for C22H34N6O2: 414.274324, found 414.275334. HPLC: Rf 3.79 min, 98.7% purity. 164

1-[6-(5-Phenyl- 1,2,4-oxadiazol-3- yl)pyridine-2-yl]- 4-[1-(propan-2- yl)piperidin-4- yl]-1,4-diazepane

 2% HRMS (ESI+) calculated for C26H34N6O: 446.27941, found 446.28124. HPLC: Rf 4.60 min, 97.1% purity. 165

1-[1-(Propan-2-yl) piperidin-4-yl]-4-{6- [5-(pyridine-2-yl)- 1,2,4-oxadiazol-3- yl]pyridine-2- yl}-1,4-diazepane tetrahydrochloride

 5% HRMS (ESI+) calculated for C25H33N7O: 447.274659, found 447.274189. HPLC: Rf 3.99 min, 98.1% purity. 166

1-[1-(Propan-2-yl) piperidin-4-yl]-4-{6- [5-(pyridine-3-yl)- 1,2,4-oxadiazol-3- yl]pyridine-2- yl}-1,4-diazepane tetrahydrochloride

 5% HRMS (ESI+) calculated for C25H33N7O: 447.274659, found 447.274019. HPLC: Rf 3.90 min, 98.5% purity. 167

1-[1-(Propan-2-yl) piperidin-4-yl]-4-{6- [5-(pyridine-4-yl)- 1,2,4-oxadiazol-3- yl]pyridine-2-yl}- 1,4-diazepane tetrahydrochloride

 5% HRMS (ESI+) calculated for C25H33N7O: 447.274659, found 447.275379. HPLC: Rf 3.70 min, 99.4% purity.

Example 168 1-[6-(2-Methyl-2H-1,2,3,4-tetrazol-5-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 139 (317 mg, 0.86 mmol) was dissolved in DMF (6 mL), NaH (69.0 mg, 60% dispersion in mineral oil, 1.71 mmol) was added and the reaction mixture was stirred for 30 min. The reaction mixture was cooled to 0° C. and a solution of MeI (182 mg, 1.28 mmol) in DMF (1 mL) was added. The reaction mixture was warmed to room temperature overnight and brine (25 mL) was added. The reaction mixture was extracted with EtOAc (3×15 mL) and the combined organic fractions were washed with brine (10 mL), dried (MgSO₄) and concentrated in vacuo. The residue was washed with heptane and purified by reverse phase HPLC to give the title compound (14.0 mg, 4%) as yellow solid. HRMS (ESI+) calculated for C20H32N8: 384.274993, found 384.276623. HPLC: Rf 6.20 min, 97.7% purity.

Example 169 1-[6-(3-Cyclopropyl-1,2,4-oxadiazol-5-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 135 (130 mg, 0.36 mmol) was dissolved in DCM (10 mL) and oxalyl chloride (92.0 mg, 0.72 mmol) and DMF (100 □L) were added. The reaction mixture was stirred for 3 h and the solvents were removed in vacuo. The residue and DIPEA (111 mg, 0.86 mmol) were dissolved in DCM (75 mL) and cooled to 0° C. N′-hydroxycyclopropanecarboximidamide (37.0 mg, 0.37 mmol) was added and the reaction mixture was stirred at 0° C. for 1 h and at room temperature for 1 h. The reaction mixture was partitioned between DCM (75 mL) and sat aq Na₂CO₃ (25 mL) and the organic fraction was washed with brine (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was suspended in xylenes (10 mL) and heated to 150° C. for 1 h. The solvents were removed in vacuo and the residue was purified by reverse phase HPLC to give the title compound (5.20 mg, 4%) as a yellow gum. HRMS (ESI+) calculated for C23H34N6O: 410.27941, found 410.28058. HPLC: Rf 4.18 min, 98.6% purity.

Example 170 1-[6-(3-Phenyl-1,2,4-oxadiazol-5-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Example 170 was prepared similarly to Example 169, using N′-hydroxybenzenecarboximidamide instead of N′-hydroxycyclopropanecarboximidamide, to give the title compound (6%) as a yellow gum. HRMS (ESI+) calculated for C26H34N6O: 446.27941, found 446.28042. HPLC: Rf 4.73 min, 98.2% purity.

Example 171 1-[6-(5-Butyl-1,3-oxazol-2-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 143 (222 mg, 0.50 mmol) was dissolved in MeCN (1.5 mL) and added to a solution of PPh₃ (393 mg, 1.50 mmol) and hexachloroethane (355 mg, 1.50 mmol) in MeCN (5 mL). The reaction mixture was stirred for 10 min, Et₃N (300 mg, 3.00 mmol) was added and the reaction mixture was heated at 50° C. overnight. A further solution of PPh₃ (131 mg, 0.50 mmol) and hexachloroethane (119 mg, 0.50 mmol) in MeCN (1 mL) was added and the reaction mixture was heated at 50° C. overnight. Brine and sat aq NaHCO₃ were added and the reaction mixture was extracted with EtOAc (3×10 mL and 2×30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (20.0 mg, 9%) as an orange gum. HRMS (ESI+) calculated for C25H39N5O: 425.315461, found 425.316761. HPLC: Rf 4.74 min, 98.8% purity.

Example 172 1-[6-(5-Cyclopropyl-1,3,4-oxadiazol-2-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane

Intermediate 146 (249 mg, 0.58 mmol) and POCl₃ (7 mL) were heated at 100° C. for 3 h. The solvents were removed in vacuo, sat aq Na₂CO₃ (13 mL) was added and the reaction mixture was extracted with EtOAc (x 3), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (15.0 mg, 6%) as a light yellow gum. HRMS (ESI+) calculated for C23H34N6O: 410.27941, found 410.28076. HPLC: Rf 3.76 min, 98.1% purity.

Example 173 1-[6-(4-Methyl-1H-pyrazol-3-yl)pyridin-2-yl]-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepane Trihydrochloride

Intermediate 148 (45.0 mg, 0.11 mmol), hydrazine hydrate (4 mL) and MeOH (few drops) were heated at reflux for 4 h. The solvents were removed in vacuo and the residue was purified by column chromatography and reverse phase HPLC. The residue was dissolved in DCM (10 mL) and HCl (5 mL, 2.0 M in Et₂O) and the solvents were removed in vacuo to give the title compound (3.60 mg, 9%) as a light yellow gum. HRMS (ESI+) calculated for C22H34N6; 382.284495, found 382.285835. HPLC: Rf 3.30 min, 100% purity.

Examples 174-184

Examples 174-184 were prepared similarly to Example 63, by reductive alkylation; see Table 21 below.

TABLE 21 Reductive alkylations of Intermediates 150 and 154-158

Ex Structure Name Ints Yield HRMS (ESI⁺), HPLC 174

N-(Cyclopropylmethyl)- 6-{7-methyl-4- [1-(propan-2-yl) piperidin-4-yl]-1,4- diazepan-1-yl}pyridine- 2-carboxamide 150*  8% HRMS (ESI+) calculated for C24H39N5O: 413.315461, found 413.315301. HPLC: Rf 3.84 min, 97.7% purity. 175

6-{7,7-Dihydrogenio- 4-[1-(propan-2- yl)piperidin-4-yl]-1,4- diazepan-1-yl}-N- (pyridine-4-yl)pyridine- 2-carboxamide 157, * 19% HRMS (ESI+) calculated for C24H32[2H]2N6O: 424.29506, found 424.29478. HPLC: Rf 3.45 min, 100% purity. 176

6-(4-{1-[(2R)-Butan- 2-yl]piperidin-4- yl}-7,7-dihydrogenio- 1,4-diazepan-1- yl)-N-(pyridine-4- yl)pyridine-2- carboxamide 157, 8 11% HRMS (ESI+) calculated for C25H34[2H]2N6O: 438.31071, found 438.31087. HPLC: Rf 3.56 min, 99.6% purity. 177

6-(4-{1-[(2S)-Butan- 2-yl]piperidin-4- yl}-7,7-dihydrogenio- 1,4-diazepan-1- yl)-N-(pyridine-4- yl)pyridine-2- carboxamide 157, 9  8% HRMS (ESI+) calculated for C25H34[2H]2N6O: 438.31071, found 438.3108. HPLC: Rf 3.56 min, 99.3% purity. 178

6-(7,7-Dihydrogenio- 4-{1-[(2S)-1,1,1- trifluoropropan-2-yl] piperidin-4-yl}-1,4- diazepan-1-yl)-N- (pyridine-4-yl)pyridine- 2-carboxamide 157, 12 10% HRMS (ESI+) calculated for C24H29[2H]2F3N6O: 478.266794, found 478.264914. HPLC: Rf 4.35 min, 98.6 purity. 179

6-[4-(1-Cyclopentyl- piperidin-4-yl)-7,7- dihydrogenio-1,4-diazepan- 1-yl]-N-(pyridine-4- yl)pyridine-2-carboxamide 157, 24  1% HRMS (ESI+) calculated for C26H34[2H]2N6O: 450.31071, found 450.30879. HPLC: Rf 3.63 min, 99.3% purity. 180

6-(4-{1-[(2-Chlorophenyl) methyl]piperidin-4- yl}-7,7-dihydrogenio-1,4- diazepan-1-yl)-N-(pyridin-4- yl)pyridine-2-carboxamide 157, 25 39% HRMS (ESI+) calculated for C28H31[2H]2ClN6O: 506.256087, found 506.256737. HPLC: Rf 3.84 min, 99.6% purity. 181

N-(Cyclopropylmethyl)- 6-{7,7-dihydrogenio- 4-[1-(propan-2-yl) piperidin-4-yl]-1,4-diazepan- 1-yl}pyridine- 2-carboxamide 158, *  9% LCMS (ES⁺): 402.4 [MH]⁺. HPLC: Rf 4.79 min, 99.6% purity. 182

6-{6-Methyl-4-[1-(propan- 2-yl)piperidin-4-yl]-1,4- diazepan-1-yl}-N- (pyridin-4-yl)pyridine-2- carboxamide 154, * 46% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29564. HPLC: Rf 3.53 min, 99.6% purity. 183

N-(Cyclopropylmethyl)- 6-{6-hydroxy-4-[1- (propan-2-yl)piperidin-4-yl]- 1,4-diazepan-1-yl}pyridine-2- carboxamide 155, * 14% HRMS (ESI+) calculated for C23H37N5O2: 415.294726, found 415.296206. HPLC: Rf 3.62 min, 100% purity. 184

N-(Cyclopropylmethyl)- 6-{5-methyl-4- [1-(propan-2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl}pyridine- 2-carboxamide 156, * 17% HRMS (ESI+) calculated for C24H39N5O: 413.315461, found 413.315271. HPLC: Rf 3.85 min, 98.5% purity. * Commercialy available

Example 185 6-{4-[3-Fluoro-1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}-N-(pyridin-3-ylmethyl)pyridine-2-carboxamide

Intermediate 43 (224 mg, 0.90 mmol) was dissolved in dioxane (3 mL) and NaOtBu (111 mg, 1.15 mmol), Pd₂(dba)₃ (30.1 mg, 0.03 mmol), Xantphos (53.7 mg, 0.07 mmol) and Intermediate 183 (200 mg, 0.82 mmol) were added. The reaction mixture was heated at 100° C. for 3 d. The solvents were removed in vacuo and the residue was dissolved in DCM, filtered and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (5.61 mg, 1%) as a light yellow solid. HRMS (ESI+) calculated for C25H35FN6O: 454.285638, found 454.287278. HPLC: Rf 3.07 min, 99.7% purity.

Example 186 6-{5,5-Dihydrogenio-4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 173 (150 mg, 0.54 mmol), Intermediate 159 (123 mg, 0.54 mmol), BINAP (33.6 mg, 0.05 mmol), palladium acetate (8.50 mg, 0.04 mmol) and Cs₂CO₃ (264 mg, 0.81 mmol) were dissolved in dioxane (2 mL) and heated at 100° C. for 4 d. The reaction mixture was filtered and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (14.1 mg, 6%) as a light yellow gum. HRMS (ESI+) calculated for C24H32[2H]2N6O: 424.29506, found 424.29411. HPLC: Rf 3.43 min, 98.5% purity.

Examples 187-202

Examples 187-202 were prepared similarly to Example 186, by Buchwald-Hartwig reactions with Intermediates 173 and 174; see Table 22 below.

TABLE 22 Buchwald-Hartwig reactions of Intermediates 173 and 174

Ex Structure Name Ints Yield HRMS (ESI⁺), HPLC 187

6-{4-[3-Fluoro- 1-(propan-2- yl)piperidin-4-yl]-5,5- dihydrogenio-1,4- diazepan-1-yl}- N-(pyridin-4- yl)pyridine-2-carboxamide 173, 182  6% HRMS (ESI+) calculated for C24H31[2H]2FN6O: 442.285638, found 442.283958. HPLC: Rf 3.42 min, 98.2% purity. 188

6-(4-{1-[(2R)-Butan- 2-yl]piperidin-4- yl}-5,5-dihydrogenio- 1,4-diazepan-1-yl)- N-(pyridin-4-yl)pyridine- 2-carboxamide 173, 164 16% HRMS (ESI+) calculated for C25H34[2H]2N6O: 438.31071, found 438.31053. HPLC: Rf 3.54 min, 99.6% purity. 189

6-(4-{1-[(2S)-Butan-2- yl]piperidin-4- yl}-5,5-dihydrogenio- 1,4-diazepan-1-yl)-N- (pyridin-4-yl)pyridine-2- carboxamide 173, 165  6% HRMS (ESI+) calculated for C25H34[2H]2N6O: 438.31071, found 438.3094. HPLC: Rf 3.54 min, 100% purity. 190

6-(5,5-Dihydrogenio-4-{1- [(2S)-1,1,1-trifluoropropan- 2-yl]piperidin-4-yl}-1,4- diazepan-1-yl)-N-(pyridin-4- yl)pyridine-2-carboxamide 173, 166 16% HRMS (ESI+) calculated for C24H29[2H]2F3N6O: 478.266794, found 478.264634. HPLC: Rf 4.35 min, 100% purity. 191

6-[4-(1-Cyclopentyl- piperidin-4-yl)-5,5- dihydrogenio-1,4-diazepan- 1-yl]-N-(pyridin-4- yl)pyridine-2-carboxamide 173, 167  2% HRMS (ESI+) calculated for C26H34[2H]2N6O: 450.31071, found 450.31108. HPLC: Rf 3.60 min, 100% purity. 192

N-(Cyclopropylmethyl)-6- {5,5-dihydrogenio- 4-[1-(propan-2-yl) piperidin-4-yl]-1,4- diazepan-1-yl}pyridine- 2-carboxamide 174, 159  1% LCMS (ES⁺): 402.5 [MH]⁺. HPLC: Rf 3.75 min, 99.5% purity. 193

6-{3-Methyl-4-[1-(propan-2- yl)piperidin-4-yl]-1,4- diazepan- 1-yl}-N-(pyridin-4-yl) pyridine-2-carboxamide 173, 168  6% HRMS (ESI+) calculated for C25H36N6O: 436.29506, found 436.29695. HPLC: Rf 3.54 min, 100% purity. 194

N-(Cyclopropylmethyl)- 6-{3-methyl-4-[1- (propan-2-yl)piperidin- 4-yl]-1,4- diazepan-1-yl}pyridine-2- carboxamide 174, 168  3% HRMS (ESI+) calculated for C24H39N5O: 413.315461, found 413.316781. HPCL: Rf 4.05 min, 100% purity. 195

6-{5,5-Dihydrogenio- 3-methyl-4-[1- (propan-2-yl)piperidin- 4-yl]-1,4-diazepan- 1-yl}-N-(pyridin-4- yl)pyridine-2-carboxamide 173, 169 10% HRMS (ESI+) calculated for C25H34[2H]2N6O: 438.31071, found 438.30995. HPLC: Rf 3.53 min, 98.9% purity. 196

6-(5,5-Dihydrogenio- 3-methyl-4-{1- [(2S)-1,1,1- trifluoropropan-2- yl]piperidin-4-yl}-1,4- diazepan-1-yl)-N- (pyridin-4-yl)pyridine- 2-carboxamide 173, 170 1% HRMS (ESI+) calculated for C25H31[2H]2F3N6O: 492.282444, found 492.281754. HPLC: Rf 4.41 min, 96.2% purity. 197

6-{6-[1-(Propan-2-yl) piperidin-4-yl]- 3,6-diazabicyclo[3.2.2] nonan-3-yl}-N- (pyridin-4-yl)pyridine- 2-carboxamide 173, 172  7% HRMS (ESI+) calculated for C26H36N6O: 448.29506, found 448.29647. HPLC: Rf 3.62 min, 100% purity. 198

6-{6-[3-Fluoro-1- (propan-2- yl)pyridin-4-yl]-3,6- diazabicyclo[3.2.2] nonan-3-yl}-N- (pyridin-4-yl)pyridine- 2-carboxamide 173, 188  1% HRMS (ESI+) calculated for C26H35FN6O: 466.285638, found 466.287348. HPLC: Rf 3.50 min, 99.7% purity. 199

N-(Cyclopropyl- methyl)-6-{6-[1- (propan-2-yl)piperidin- 4-yl]-3,6-diaza- bicyclo[3.2.2]nonan- 3-yl}pyridine- 2-carboxamide trihydrochloride 174, 172 15% HRMS (ESI+) calculated for C25H39N5O: 425.315461, found 425.314961. HPLC: Rf 3.85 min, 97.5% purity. 200

N-(Cyclopropyl- methyl)-6-{3-[1- (propan-2-yl)piperidin- 4-yl]-3,6-diaza- bicyclo[3.2.1]octan-6-yl} pyridine-2-carboxamide 174 32% HRMS (ESI+) calculated for C24H37N5O: 411.299811, found 411.298381. HPLC: Rf 3.64 min 99.2% purity. 201

6-(4-{2-[4- (Propan-2-yl) morpholin-3- yl]ethyl}-1,4-diazepan- 1-yl)-N-(pyridin- 4-yl)pyridine 2-carboxamide 173, 243 15% HRMS (ESI+) calculated for C25H36N6O2: 452.289974, found 452.291804. HPLC: Rf 3.50 min, 99.3% purity. 202

6-(4-{[(2R)-1- Methyl-4-(propan-2- yl)piperazin-2-yl] methyl}-1,4-diazepan- 1-yl)-N-(pyridin- 4-yl)pyridine-2- carboxamide 173, 249  2% HRMS (ESI+) calculated for C25H37N7O: 451.305959, found 451.307619. HPLC: Rf 3.59 min, 99.5% purity.

Example 203 6-(4-{1-[(2-Chloro-4-fluorophenyl)methyl]piperidin-4-yl}-5,5-dihydrogenio-1,4-diazepan-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 175 (200 mg, 0.52 mmol) was dissolved in DCM (30 mL) and 2-chloro-4-fluorobenzaldehyde (166 mg, 1.05 mmol) and NaBH(OAc)₃ (554 mg, 2.61 mmol) were added. The reaction mixture was stirred for 18 h, diluted with DCM (30 mL), washed with sat aq Na₂CO₃ (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (69.7 mg, 25%) as a pale yellow solid. HRMS (ESI+) calculated for C28H30[2H]2ClFN6O: 524.246666, found 524.245956. HPLC: Rf 3.93 min, 99.3% purity.

Examples 204-209

Examples 204-209 were prepared similarly to Example 203, by reacting Intermediates 175, 185, 191 and 273 with the appropriate aldehyde; see Table 23 below.

TABLE 23 Reductive alkylation reactions with Intermediates 175, 185, 191 and 273

HRMS Ex Structure Name Int Yield (ESI⁺), HPLC 204

6-(4-{1-[(2- Chlorophenyl)methyl]piperidin-4- yl}-5,5-dihydrogenio-1,4-diazepan- 1-yl)-N-(pyridin-4-yl)pyridine-2- carboxamide 175 18% HRMS (ESI+) calculated for C28H31[2H]2ClN6O: 506.256087, found 506.256187. HPLC: Rf 3.86 min, 98.9% purity. 205

6-(4-{1-[(2-Chloro-4- fluorophenyl)methyl]piperidin- 4-yl}-7,7-dihydrogenio-1,4- diazepan-1-yl)-N-(pyridin-4- yl)pyridine-2-carboxamide 273 17% HRMS (ESI+) calculated for C28H30[2H]2ClFN6O: 524.246666, found 524.246206. HPLC: Rf 3.95 min, 99.5% purity. 206

6-(4-{1-[(2-Chlorophenyl)methyl] piperidin-4-yl}-5,5-dihydrogenio-3- methyl-1,4-diazepan-1-yl)-N- (pyridin-4-yl) pyridine-2-carboxamide 185 27% HRMS (ESI+) calculated for C29H33[2H]2ClN6O: 520.271738, found 520.271778. HPLC: Rf 3.94 min, 100% purity. 207

6-(4-{1-[(2-Chloro- 4-fluorophenyl) methyl]piperidin-4-yl}-5,5- dihydrogenio-3-methyl-1,4- diazepan-1-yl)-N- (pyridin-4-yl)pyridine-2- carboxamide 185  8% HRMS (ESI+) calculated for C29H32[2H]2ClFN6O: 538.262316, found 538.261216. HPLC: Rf 4.01 min, 99.1% purity. 208

6-(6-{1-[(2- Chlorophenyl)methyl]piperidin-4- yl}-3,6-diazabicyclo[3.2.2]nonan-3- yl)-N-(pyridin-4-yl)pyridine-2- carboxamide 191  6% HRMS (ESI+) calculated for C30H35ClN6O: 530.256087, found 530.256037. HPLC: Rf 3.98 min, 99.8% purity. 209

6-(6-{1-[(2-Chloro-4- fluorophenyl)methyl]piperidin- 4-yl}-3,6-diazabicyclo [3.2.2]nonan-3-yl)-N- (pyridin-4-yl)pyridine-2- carboxamide 191  7% HRMS (ESI+) calculated for C30H34ClFN6O: 548.246666, found 548.246636. HPLC: Rf 4.07 min, 100% purity.

Example 210 6-{4-[3-Fluoro-1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}-N-(pyridin-4-yl)pyridine-2-carboxamide

Example 210 was prepared similarly to Example 203, using Intermediate 125 instead of Intermediate 175 and acetone instead of 2-chloro-4-fluorobenzaldehyde, to give the title compound (22%) as a colourless gum. HRMS (ESI+) calculated for C24H33FN6O: 440.269988, found 440.271298. HPLC: Rf 3.40 min, 100% purity.

Examples 211-214

Examples 211-214 were prepared similarly to Example 210, by reacting Intermediates 126, 176 and 177 with the appropriate ketone; see Table 24 below.

TABLE 24 Reductive alkylation reactions with Intermediates 126, 176 and 177

HRMS (ESI⁺), Ex Structure Name Ints Yield HPLC 211

6-{4-[3-Fluoro- 1-(propan-2- yl)piperidin-4- yl]-7,7-dihydrogenio- 1,4-diazepan-1- yl}-N-(pyridin-4- yl)pyridine-2- carboxamide 176 21% HRMS (ESI+) calculated for C24H31[2H]2FN6O: 442.285638, found 442.284838. HPLC: Rf 3.86 min, 98.2% purity. 212

1-[6-(4-Cyclopropyl- 1H-imidazol-2- yl)pyridin-2-yl]- 4-[3-fluoro-1- (propan-2-yl) piperidin-4-yl]-1,4- diazepane 126 30% HRMS (ESI+) calculated for C24H35FN6: 427.298, found 427.29803. HPLC: Rf 3.58 min, 99.1% purity. 213

1-[6-(4- Cyclopropyl-5-methyl- 1H-imidazol-2-yl) pyridin-2-yl]-4-[3- fluoro-1-(propan- 2-yl)piperidin-4-yl]- 1,4-diazepane 177 15% HRMS (ESI+) calculated for C25H37FN6: 441.31365, found 441.3136. HPLC: Rf 3.71 min, 98.4% purity. 214

1-(1-Cyclopentyl-3- fluoropiperidin-4- yl)-4-[6-(4-cyclopropyl- 5-methyl-1H- imidazol-2-yl) pyridin-2-yl]-1,4- diazepane 177  8% HRMS (ESI+) calculated for C27H39FN6: 467.3293, found 467.3287. HPLC: Rf 3.81 min, 99.3% purity.

Example 215 6-{4-[2-Methyl-1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}-N-(pyridin-3-ylmethyl)pyridine-2-carboxamide

Example 215 was prepared similarly to Example 203, using Intermediate 127 instead of Intermediate 175 and acetone instead of 2-chloro-4-fluorobenzaldehyde, to give the title compound (1%) as a white solid. HRMS (ESI+) calculated for C26H38N6O: 450.31071, found 450.31244. HPLC: Rf 3.24 min, 100% purity.

Example 216 N-(Cyclopropylmethyl)-6-{4-[(3R)-3-hydroxy-1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Example 216 was prepared similarly to Example 203, using Intermediate 128 instead of Intermediate 175 and acetone instead of 2-chloro-4-fluorobenzaldehyde, to give the title compound (14%) as a white solid. HRMS (ESI+) calculated for C23H37N5O2: 415.294726, found 415.295486. HPLC: Rf 3.58 min, 100% purity.

Example 217 N-(Cyclopropylmethyl)-6-{10-[1-(propan-2-yl)piperidin-4-yl]-3,10-diazabicyclo[4.3.1]decan-3-yl}pyridine-2-carboxamide

Example 217 was prepared similarly to Example 63, using Intermediate 192 instead of Intermediate 81, to give the title compound (11%) as a colourless gum. HRMS (ESI+) calculated for C26H41N5O: 439.331111, found 439.333241. HPLC: Rf 4.18 min, 98.9% purity.

Example 218 6-(10-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-3,10-diazabicyclo[4.3.1]decan-3-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Example 218 was prepared similarly to Example 217, using Intermediate 193 instead of Intermediate 192 and Intermediate 25 instead of 1-(propan-2-yl)piperidin-4-one, to give the title compound (23%) as a yellow solid. HRMS (ESI+) calculated for C31H37ClN6O: 544.271738, found 544.271478. HPLC: Rf 4.08 min, 99.4% purity.

Example 219 1-(6-{4-[1-(Propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridin-2-yl)butan-1-one

Intermediate 184 (100 mg, 0.26 mmol) was dissolved in THF (3 mL) and propylmagnesium bromide (1.28 mL, 2 M in Et₂O, 2.57 mmol) was added. The reaction mixture was stirred for 18 h and concentrated in vacuo. The residue was dissolved in DCM (20 mL), washed with sat aq Na₂CO₃ (15 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (20.2 mg, 21%) as a yellow gum. HRMS (ESI+) calculated for C22H36N4O: 372.288912, found 372.290132. HPLC: Rf 4.18 min, 99.2% purity.

Example 220 2-Phenyl-1-(6-{4-[1-(propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}pyridin-2-yl)ethan-1-one

Intermediate 184 (342 mg, 0.88 mmol) was dissolved in THF (8 mL) and benzylmagnesium chloride (8.78 mL, 1 M in Et₂O, 8.78 mmol) was added. The reaction mixture was stirred for 18 h and the solvents were removed in vacuo. The residue was dissolved in DCM (20 mL), washed with sat aq Na₂CO₃ (15 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (2.83 mg, 1%) as a yellow gum. HRMS (ESI+) calculated for C26H36N4O: 420.288912, found 420.290762. HPLC: Rf 4.50 min, 99.6% purity.

Example 221 6-({1-[1-(Propan-2-yl)azepan-4-yl]piperidin-4-yl}oxy)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 200 (102 mg, 0.26 mmol) was dissolved in DCM (3 mL) and acetone (19.0 □L, 0.26 mmol) and NaBH(OAc)₃ (273 mg, 1.29 mmol) were added. The reaction mixture was stirred for 2 d, diluted with DCM (30 mL) and quenched with sat aq Na₂CO₃ (20 mL). The aq fraction was extracted with DCM (2×15 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (0.86 mg, 1%) as a colourless gum. HRMS (ESI+) calculated for C25H35N5O2: 437.279075, found 437.279315. HPLC: Rf 3.45 min, 95.6% purity.

Example 222 6-({1-[1-(Propan-2-yl)piperidin-4-yl]piperidin-3-yl}amino)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 201 (54.0 mg, 0.14 mmol) was dissolved in DCM (4 mL) and TFA (1 mL) was added. The reaction mixture was stirred for 2 h. The solvents were removed in vacuo and the residue partitioned between DCM (20 mL) and 1 M aq NaOH (20 mL). The aq fraction was basified to pH 14 with NaOH and extracted with DCM (3×50 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM (5 mL) and 1-(propan-2-yl)piperidin-4-one (40.0 □L, 0.27 mmol) and NaBH(OAc)₃ (57.0 mg, 0.30 mmol) were added. The reaction mixture was stirred for 4 d. Further 1-(propan-2-yl)piperidin-4-one (40.0 □L, 0.27 mmol) and NaBH(OAc)₃ (57.0 mg, 0.30 mmol) were added. The reaction mixture was stirred for 1 d. The reaction mixture was diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (2.33 mg, 4%) as a white gum. LCMS (ES⁺): 423.2 [MH]⁺. HPLC: Rf 3.49 min, 99.2% purity.

Example 223 (3R)-1-[6-(4-Cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]-N-{[1-(propan-2-yl)piperidin-4-yl]methyl}pyrrolidin-3-amine

Intermediate 206 (75.0 mg, 0.18 mmol) was dissolved in THF (5 mL), the reaction mixture was cooled to 0° C. and LiAlH₄ (0.71 mL, 2.4 M in THF, 1.77 mmol) was added. The reaction mixture was heated at reflux for 5 h and cooled to 0° C. The reaction mixture was diluted with Et₂O (20 mL) and quenched with water (0.40 mL) and 1 M aq NaOH (0.20 mL). MgSO₄ was added and the reaction was stirred for 15 min, filtered and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (8.39 mg, 12%) as a beige solid. HRMS (ESI+) calculated for C24H36N6: 409.30742, found 409.30701. HPLC: Rf 3.61 min, 99.4% purity.

Example 224 (3R)—N-{[(3S)-1-Cyclopentylpyrrolidin-3-yl]methyl}-1-[6-(4-cyclopropyl-5-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-amine

Example 224 was prepared similarly to Example 223, using Intermediate 210 instead of Intermediate 206, to give the title compound (22.1 mg, 44%) as a white solid. HRMS (ESI+) calculated for C26H38N6: 435.32307, found 435.32275. HPLC: Rf 3.58 min, 98.4% purity.

Example 225 (3R)—N-{[(3R)-1-Cyclopentylpyrrolidin-3-yl]methyl}-1-[6-(4-cyclopropyl-5-methyl-1H-imidazol-2-yl)pyridin-2-yl]pyrrolidin-3-amine

Example 225 was prepared similarly to Example 223, using Intermediate 211 instead of Intermediate 206, to give the title compound (30.3 mg, 46%) as a white solid. HRMS (ESI+) calculated for C26H38N6: 435.32307, found 435.32291. HPLC: Rf 3.57 min, 98.4% purity.

Example 226 6-[(3R)-3-({[(3S)-1-Cyclopentylpyrrolidin-3-yl]methyl}amino)pyrrolidin-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 213 (300 mg, 0.82 mmol) was dissolved in DCM (10.0 mL), cyclopentanone (72.3 mg, 0.86 mmol) and NaBH(OAc)₃ (347 mg, 1.64 mmol) were added and the reaction mixture was stirred overnight. The reaction mixture was diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound as a white solid (98.9 mg, 28%). HRMS (ESI+) calculated for C25H34N6O: 435.28669, found 435.28659. HPLC: Rf 3.26 min, 100% purity.

Example 227 6-[(3R)-3-({[(3R)-1-Cyclopentylpyrrolidin-3-yl]methyl}amino)pyrrolidin-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Example 227 was prepared similarly to Example 226, using Intermediate 214 instead of Intermediate 213, to give the title compound (6%) as a light yellow solid. HRMS (ESI+) calculated for C25H34N6O: 435.28669, found 435.28711. HPLC: Rf 3.27 min, 100% purity.

Example 228 6-[(3R)-3-{[(1-Cyclopentylpiperidin-4-yl)methyl]amino}pyrrolidin-1-yl]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 215 was dissolved in DCM (10 mL) and cyclopentanone (170 mg, 2.02 mmol) and NaBH(OAc)₃ (779 mg, 3.68 mmol) were added. The reaction mixture was stirred overnight, diluted with DCM (25 mL) and quenched with water (10 mL). The organic fraction was washed with sat aq Na₂CO₃ (510 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (10.9 mg, 1%) as a white solid. HRMS (ESI+) calculated for C26H36N6O: 449.30234, found 449.30127. HPLC: Rf 3.25 min, 99.8% purity.

Example 229 [(1-Cyclopentylpyrrolidin-3-yl)methyl](2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)amine

Intermediate 225 (150 mg, 0.37 mmol) was dissolved in THF (5 mL) at 0° C. and LiAlH₄ (1.00 mL, 2.4 M in THF, 2.40 mmol) was added dropwise. The reaction mixture was heated at 67° C. for 18 h. The reaction mixture was cooled to −5° C. and quenched with water (98 □L), 15% aq NaOH (98 □L) and water (300 □L). The residue was extracted with EtOAc (7×10 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC and column chromatography to give the title compound (4.07 mg, 3%) as a light yellow gum. LCMS (ES⁺): 395.2 [MH]⁺. HPLC: Rf 3.70 min, 99.6% purity.

Example 230 1-Cyclopentyl-N-(2-{[6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)piperidin-3-amine

Intermediate 228 (226 mg, 0.53 mmol) was dissolved in DCM (4 mL), TFA (1 mL) was added and the reaction mixture was stirred for 3 h. The solvents were removed in vacuo and the residue was de-salted using a MP-TsOH SPE cartridge, eluting with 7 N ammonia in MeOH. Half of the residue was dissolved in DCM (5 mL) and cyclopentanone (19.8 □L, 0.22 mmol) and NaBH(OAc)₃ (85.7 mg, 0.40 mmol) were added. The reaction mixture was stirred overnight, diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the crude title compound (13.2 mg, 17%) as a white solid HRMS (ESI+) calculated for C23H34N6: 395.29177, found 395.29117. HPLC: Rf 3.63 min, 98.2% purity.

Example 231 N-{2-[(1-Cyclopentylpiperidin-3-yl)amino]ethyl}-6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-amine

Example 231 was prepared similarly to Example 230, using Intermediate 229 instead of Intermediate 228, to give the title compound (22%) as a white solid. HRMS (ESI+) calculated for C24H36N6: 409.30742, found 409.30695. HPLC: Rf 3.81 min, 96.7% purity.

Example 232 1-Cyclopentyl-N-(2-{[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)piperidin-4-amine

Example 232 was prepared similarly to Example 231, using Intermediate 230 instead of Intermediate 229, to give the title compound (11%) as a white solid. HRMS (ESI+) calculated for C24H36N6: 409.30742, found 409.30737. HPLC: Rf 3.78 min, 98.4% purity.

Example 233 N-{2-[(1-Cyclopentylpyrrolidin-3-yl)amino]ethyl}-6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-amine

Example 233 was prepared similarly to Example 230, using Intermediate 231 instead of Intermediate 228, to give the title compound (11%) as an off-white solid. HRMS (ESI+) calculated for C22H32N6: 381.27612, found 381.27554. HPLC: Rf 3.74 min, 98.5% purity.

Example 234 6-[(2-{[1-(Propan-2-yl)azepan-4-yl]amino}ethyl)amino]-N-(pyridin-4-yl)pyridine-2-carboxamide

Example 234 was prepared similarly to Example 230, using Intermediate 232 instead of Intermediate 228 and acetone instead of cyclopentanone, to give the title compound (18%) as a colourless gum. HRMS (ESI+) calculated for C22H32N6O: 396.26376, found 396.26423. HPLC: Rf 3.35 min, 95.1% purity.

Example 235 1-[(2R)-Butan-2-yl]-N-(2-{[6-(4-ethyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)piperidin-4-amine

Intermediate 217 (168 mg, 0.73 mmol) was dissolved in DCM (3 mL) and (R)-1-sec-butyl-piperidin-4-one (169 mg, 1.09 mmol) and NaBH(OAc)₃ (308 mg, 1.45 mmol) were added. The reaction mixture was stirred overnight, diluted with DCM (10 mL) and quenched with water (5 mL). The organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (66.7 mg, 25%) as a white solid. HRMS (ESI+) calculated for C21H34N6: 371.29177, found 371.29163. HPLC: Rf 3.52 min, 99.5% purity.

Example 236 N-(2-{[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)-1-(propan-2-yl)piperidin-4-amine

Example 236 was prepared similarly to Example 235, using Intermediate 218 instead of Intermediate 217 and 1-(propan-2-yl)piperidin-4-one instead of (R)-1-sec-butyl-piperidin-4-one, to give the title compound (9%) as a white solid. HRMS (ESI+) calculated for C22H34N6: 383.29177, found 383.29147. HPLC: Rf 3.60 min, 97.2% purity.

Example 237 N-(2-{[3-(Cyclopentylamino)propyl]amino}ethyl)-6-(5-cyclopropyl-1H-imidazol-2-yl)pyridin-2-amine

Example 237 was prepared similarly to Example 229, using Intermediate 235 instead of Intermediate 225, to give the title compound (17%) as a pale yellow gum. HRMS (ESI+) calculated for C21H32N6: 369.27612, found 369.27597. HPLC: Rf 3.62 min, 99.3% purity.

Example 238 6-[Methyl(2-{methyl[1-(propan-2-yl)azepan-4-yl]amino}ethyl)amino]-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 220 (163 mg, 0.64 mmol) was dissolved in DCM (10 mL) and Intermediate 236 (299 mg, 1.93 mmol) and NaBH(OAc)₃ (880 mg, 3.21 mmol) were added. The reaction mixture was stirred for 3 d, diluted with DCM (20 mL) and quenched with sat aq Na₂CO₃ (20 mL). The aq fraction was extracted with DCM (2×15 mL) and the combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (2.49 mg, 1%) as a colourless gum. HRMS (ESI+) calculated for C24H36N6O: 424.29506, found 424.29622. HPLC: Rf 3.43 min, 100% purity.

Example 239 6-[(3-{[1-(Propan-2-yl)piperidin-4-yl]amino}propyl)amino]-N-(pyridin-4-yl)pyridine-2-carboxamide

Example 239 was prepared similarly to Example 238, using Intermediate 221 instead of Intermediate 220 and 1-(propan-2-yl)piperidin-4-one instead of Intermediate 236, to give the title compound (1%) as a yellow solid. HRMS (ESI+) calculated for C22H32N6O: 396.26376, found 396.26402. HPLC: Rf 3.38 min, 98.3% purity.

Example 240 6-(4-{1-[(2-Methylphenyl)methyl]azepan-4-yl}piperazin-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 238 (250 mg, 0.30 mmol) was dissolved in MeCN (20 mL) and K₂CO₃ (220 mg, 1.58 mmol) and 2-methylbenzyl bromide (50.0 mg, 0.29 mmol) were added. The reaction mixture was heated at 50° C. for 3 h and the solvents were removed in vacuo. The residue was partitioned between DCM (100 mL) and water (50 mL), the organic fraction was washed with brine (50 mL), dried (MgSO₄) and the solvents were removed in vacuo. The residue was purified by reverse phase HPLC to give the title compound (0.050 g, 38%) as a light yellow gum. HRMS (ESI+) calculated for C29H36N6O: 484.29506, found 484.29613. HPLC: Rf 3.86 min, 98.9% purity.

Example 241 6-(4-{1-[(2-Chloro-4-fluorophenyl)methyl]azepan-4-yl}piperazin-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 238 (50.0 mg, 0.53 mmol) was dissolved in DCM (20 mL) and 2-chloro-4-fluorobenzaldehyde (170 mg, 1.05 mmol) and NaBH(OAc)₃ (0.56 g, 2.63 mmol) were added. The reaction mixture was stirred for 96 h, diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (75 mL), brine (50 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (0.060 g, 23%) as a yellow gum. HRMS (ESI+) calculated for C28H32ClFN6O: 522.231016, found 522.233146. HPLC: Rf 3.91 min, 100% purity.

Example 242 6-{4-[1-(Propan-2-yl)azepan-4-yl]piperazin-1-yl}-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 237 (71.0 mg, 0.15 mmol) was dissolved in DCM (10 mL), TFA (1 mL) was added and the reaction mixture was stirred for 18 h. The solvents were removed in vacuo, the residue was dissolved in DCM (10 mL), and acetone (17.2 mg, 0.30 mmol) and NaBH(OAc)₃ (157 mg, 0.74 mmol) were added. The reaction mixture was stirred for 7 h, diluted with DCM (20 mL), washed with sat aq Na₂CO₃ (25 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (12.4 mg, 20%) as a light yellow gum. HRMS (ESI+) calculated for C24H34N6O: 422.27941, found 422.28141. HPLC: Rf 3.35 min, 97.4% purity.

Example 243 4-{4-[6-(5-Cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]piperazin-1-yl}-1-(propan-2-yl)azepane

Example 243 was prepared similarly to Example 242, using Intermediate 240 instead of Intermediate 237, to give the title compound (49%) as a white solid. HRMS (ESI+) calculated for C25H38N6: 423.32307, found 423.32147. HPLC: Rf 3.67 min, 99.6% purity.

Example 244 6-(4-{[(2R)-4-(Propan-2-yl)morpholin-2-yl]methyl}-1,4-diazepan-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Example 244 was prepared similarly to Example 242, using Intermediate 252 instead of Intermediate 237, to give the title compound (15%) as a white solid. HRMS (ESI+) calculated for C24H34N6O2: 438.274324, found 438.275684. HPLC: Rf 3.51 min, 99.1% purity.

Example 245 1-Cyclopentyl-4-{4-[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]piperazin-1-yl}azepane

Example 245 was prepared similarly to Example 243, using cyclopentanone instead of acetone, to give the title compound (28%) as a white solid. HRMS (ESI+) calculated for C27H40N6: 449.33872, found 449.33856. HPLC: Rf 3.80 min, 99.4% purity.

Example 246 1-Cyclopentyl-N-(2-{[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)azepan-4-amine

Example 246 was prepared similarly to Example 245, using Intermediate 233 instead of Intermediate 240, to give the title compound (12%) as a white solid. HRMS (ESI+) calculated for C25H38N6: 423.32307, found 423.32214. HPLC: Rf 3.78 min, 98.1% purity.

Example 247 {[(3S)-1-Cyclopentylpyrrolidin-3-yl]methyl}(2-{[6-(5-cyclopropyl-4-methyl-1H-imidazol-2-yl)pyridin-2-yl]amino}ethyl)amine

Example 247 was prepared similarly to Example 223, using Intermediate 227 instead of Intermediate 206, to give the title compound (8.77 mg, 8%) as a white solid. HRMS (ESI+) calculated for C24H36N6: 409.30742, found 409.30582. HPLC: Rf 3.50 min, 98.2% purity.

Example 248 6-(4-{[(2-Chlorophenyl)methyl]amino}piperidin-1-yl)-N-(cyclopropylmethyl)pyridine-2-carboxamide

Intermediate 203 (427 mg, 1.38 mmol) and 2-chlorobenzaldehyde (193 mg, 1.38 mmol) were dissolved in DCM (10 mL) and NaBH(OAc)₃ (1.46 g, 6.88 mmol) was added. The reaction mixture was stirred for 16 h and quenched with sat aq Na₂CO₃ (5 mL). The reaction mixture was diluted with a DCM (20 mL), washed with sat aq Na₂CO₃ solution (3×15 mL), brine (15 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (22.9 mg, 4%) as a light yellow gum. HRMS (ESI+) calculated for C22H27ClN4O; 399.19462, found 399.19543. PLC: Rf 5.16 min, 100% purity.

Example 249 6-(4-{[1-(Propan-2-yl)piperidin-4-yl]amino}piperidin-1-yl)-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 274 (254 mg, 0.64 mmol) was dissolved in DCM (8 mL), TFA (2 mL) was added and the reaction mixture was stirred overnight. The solvents were removed in vacuo and the residue partitioned between DCM (20 mL) and 1M aq NaOH (10 mL). The aq fraction was basified to pH 14 with NaOH and extracted with DCM (3×50 mL). The combined organic fractions were dried (MgSO₄) and the solvents were removed in vacuo. The residue was dissolved in DCM (6 mL) and 1-(propan-2-yl)piperidin-4-one (78.0 □L, 0.53 mmol) and NaBH(OAc)₃ (111 mg, 0.50 mmol) were added. The reaction mixture was stirred for 3 d. Further 1-(propan-2-yl)piperidin-4-one (78.0 □L, 0.53 mmol) and NaBH(OAc)₃ (111 mg, 0.50 mmol) were added and the reaction mixture was stirred overnight. The reaction mixture was diluted with DCM (10 mL), quenched with water (5 mL) and the organic fraction was washed with sat aq Na₂CO₃ (5 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (22.0 mg, 11%) as a white solid. HRMS (ESI+) calculated for C24H34N6O: 422.27941, found 422.28129. HPLC: Rf 3.53 min, 100% purity.

Example 250 N-Butyl-6-(4-{[4-(propan-2-yl)morpholin-2-yl]methyl}-1,4-diazepan-1-yl)pyridine-2-carboxamide

Example 250 was prepared similarly to Example 242 using Intermediate 239 instead of Intermediate 237, to give the title compound (19%) as a colourless gum. HRMS (ESI+) calculated for C23H39N5O2: 417.310376, found 417.312286. HPLC: Rf 3.99 min, 100% purity.

Example 251 6-{4-[(2-Chloro-4-fluorophenyl)methyl]-1,4-diazepan-1-yl}-N-(pyridin-4-yl)pyridine-2-carboxamide

Intermediate 83 (256 mg, 0.86 mmol) was dissolved in DCM (15 mL), 2-chloro-4-fluorobenzaldehyde (149 mg, 0.94 mmol) and NaBH(OAc)₃ (907 mg, 4.28 mmol) were added and the reaction mixture was stirred for 18 h. The reaction mixture was diluted with DCM (30 mL), washed with sat aq Na₂CO₃ (35 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (116 mg, 31%) as a light yellow gum. HRMS (ESI+) calculated for C23H23ClFN5O: 439.157516, found 439.157156. HPLC: Rf 4.40 min, 100% purity.

Example 252 N-(Cyclopropylmethyl)-6-{4-[3-(1,2,3,4-tetrahydroisoquinolin-2-yl)propyl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Intermediate 81 (100 mg, 0.36 mmol), K₂CO₃ (75.6 mg, 0.55 mmol) and Intermediate 244 (98.2 mg, 0.36 mmol) were dissolved in MeCN (2 mL) and heated at 70° C. for 18 h. The reaction mixture was filtered, washing with DCM (20 mL) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (28.4 mg, 17%) as a yellow gum. HRMS (ESI+) calculated for C27H37N5O: 447.299811, found 447.298621. HPLC: Rf 4.18 min, 97.5% purity.

Example 253 N-(Cyclopropylmethyl)-6-{4-[3-(3,3-difluoropyrrolidin-1-yl)propyl]-1,4-diazepan-1-yl}pyridine-2-carboxamide

Example 253 was prepared similarly to Example 252, using Intermediate 245 instead of Intermediate 244, to give the title compound as a colourless gum (15.3 mg, 10%). HRMS (ESI+) calculated for C22H33F2N5O: 421.265317, found 421.265627. HPLC: Rf 3.85 min, 98.8% purity.

Example 254 6-{4-[2-Hydroxy-3-(propan-2-ylamino)propyl]-1,4-diazepan-1-yl}-N-(pyridin-3-ylmethyl)pyridine-2-carboxamide

Intermediate 246 (206 mg, 0.51 mmol) was dissolved in IPA (10 mL), isopropylamine (151 mg, 2.55 mmol) was added and the reaction mixture was heated at reflux for 3 h. The reaction mixture was concentrated in vacuo and purified by column chromatography to give the title compound (192 mg, 88%) as a white solid. HRMS (ESI+) calculated for C23H34N6O2: 426.274324, found 426.276264. HPLC: Rf 2.98 min, 98.3% purity.

Example 255 1-[6-(4-Cyclopropyl-1H-imidazol-2-yl)pyridin-2-yl]-4-[4-(pyrrolidin-1-yl)cyclohexyl]-1,4-diazepane

Intermediate 106 (520 mg, 1.37 mmol) and 4-(pyrrolidin-1-yl)cyclohexan-1-one (687 mg, 4.11 mmol) were dissolved in DCM (10 mL) and NaBH(OAc)₃ (1.02 g, 4.80 mmol) was added. The reaction mixture was stirred overnight, poured into 1 M aq Na₂CO₃ (25 mL) and extracted with DCM (3×25 mL). The combined organic fractions were dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (31.0 mg, 5%) as a white solid. HRMS (ESI+) calculated for C26H38N6: 435.32307, found 435.32434. HPLC: Rf 3.68 min, 99.7% purity.

Example 256 6-[4-(4-tert-Butylcyclohexyl)-1,4-diazepan-1-yl]-N-(pyridin-3-ylmethyl)pyridine-2-carboxamide

Intermediate 134 (100 mg, 0.28 mmol), 3-(aminomethyl)-pyridine (45.1 mg, 0.42 mmol), HBTU (106 mg, 0.28 mmol) and DIPEA (108 mg, 0.83 mmol) were dissolved in DMF (2 mL) and stirred for 4 h. The solvents were removed in vacuo and the residue purified by reverse phase HPLC to give the title compound (2.87 mg, 2%) as a colourless gum. HRMS (ESI+) calculated for C27H39N5O: 449.315461, found 449.316351. HPLC: Rf 4.77 min, 99.2% purity.

Example 257 N-(Pyridin-4-yl)-6-(4-{4-[2-(trifluoromethyl)pyrrolidin-1-yl]cyclohexyl}-1,4-diazepan-1-yl)pyridine-2-carboxamide

Intermediate 83 (100 mg, 0.34 mmol), 4-(2-trifluoromethyl-pyrrolidin-1-yl)-cyclohexanone (98.9 mg, 0.42 mmol) and NaBH(OAc)₃ (356 mg, 1.68 mmol) were stirred for 7 d. The reaction mixture was diluted with DCM (15 mL), washed with sat aq Na₂CO₃ (25 mL), brine (20 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (5.67 mg, 3%) as a light yellow gum. HRMS (ESI+) calculated for C27H35F3N6O: 516.282444, found 516.281974. HPLC: Rf 4.11 min, 99.2% purity.

Example 258 6-[4-(3-{[(2-Chlorophenyl)methyl]amino}propyl)-1,4-diazepan-1-yl]-N-(cyclopropylmethyl)pyridine-2-carboxamide

Intermediate 253 (200 mg, 0.43 mmol) and hydrazine monohydrate (27.8 mg, 0.87 mmol) were dissolved in EtOH (20 mL) and the reaction mixture was stirred for 6 h. The solvents were removed in vacuo and 2-chlorobenzaldehyde (122 mg, 0.87 mmol), DCM (10 mL) and NaBH(OAc)₃ (459 mg, 2.17 mmol) were added. The reaction mixture was stirred for 18 h. The reaction mixture was diluted with DCM (50 mL), washed with sat aq Na₂CO₃ (40 mL), brine (30 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to the title compound (13.2 mg, 7%) as a colourless gum. HRMS (ESI+) calculated for C25H34ClN5O: 455.245188, found 455.245878. HPLC: Rf 4.36 min, 99.1% purity.

Example 259 6-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)pyridine-2-carbonitrile

Example 136 (50.0 mg, 0.12 mmol) was dissolved in THF (1 mL), the reaction mixture was cooled to −5° C. and trifluoroacetic anhydride (19.8 □L, 0.14 mmol) and Et₃N (39.0 □L, 0.28 mmol) were added. The reaction mixture was stirred for 5 h, concentrated in vacuo, diluted with DCM (20 mL), washed with sat aq Na₂CO₃ (10 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (12.4 mg, 26%) as a yellow solid. HRMS (ESI+) calculated for C23H28ClN5: 409.203324, found 409.203394. HPLC: Rf 4.32 min, 98.1% purity.

Example 260 [6-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)pyridin-2-yl]methanol

Intermediate 133 (190 mg, 0.43 mmol) was dissolved in MeOH (5 mL) and the reaction mixture was cooled to 0° C. NaBH₄ (64.9 mg, 1.72 mmol) was added and the reaction mixture was stirred at 60° C. for 2 d. Further NaBH₄ (64.9 mg, 1.72 mmol) was added and the reaction mixture was stirred at 60° C. for 3 d. The solvents were removed in vacuo and the residue was partitioned between DCM (25 mL) and sat aq Na₂CO₃ (20 mL). The organic fraction was dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase HPLC to give the title compound (31.4 mg, 18%) as an off-white solid. HRMS (ESI+) calculated for C23H31ClN4O: 414.218639, found 414.218919. HPLC: Rf 3.37 min, 100% purity.

Example 261 1-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-4-(pyridin-2-yl)-1,4-diazepane

Intermediate 258 (361 mg, 1.39 mmol) was dissolved in DCM (15 mL), 2-chlorobenzaldehyde (343 □L, 3.05 mmol) and NaBH(OAc)₃ (1.18 g, 5.55 mmol) were added and the reaction mixture was stirred for 18 h. The reaction mixture was diluted with DCM (30 mL) and quenched with water (15 mL). The organic fraction was washed with sat aq Na₂CO₃ (15 mL), dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (49.4 mg, 9%) as a colourless gum. HRMS (ESI+) calculated for C22H29ClN4: 384.208075, found 384.208755. HPLC: Rf 3.34 min, 99.2% purity.

Examples 262-264

Examples 262-264 were prepared similarly to Example 261, using Intermediates 259-261 instead of Intermediate 258; see Table 25 below.

TABLE 25 Reductive alkylation reactions of Intermediates of 259-261

Ex Structure Name Ints Yield HRMS (ESI⁺), HPLC 262

1-{1-[(2- Chlorophenyl)methyl] piperidin-4-yl}-4-(6- methylpyridin-2-yl)-1,4- diazepane 259 24% HRMS (ESI+) calculated for C23H31ClN4: 398.223725, found 398.223905. HPLC: Rf 3.47 min, 100% purity. 263

1-{1-[(2- Chlorophenyl)methyl] piperidin-4-yl}-4-(5- methylpyridin-2-yl)-1,4- diazepane 260 35% HRMS (ESI+) calculated for C23H31ClN4: 398.223725, found 398.224045. HPLC: Rf 3.50 min, 100% purity. 264

1-{1-[(2- Chlorophenyl)methyl]piperidin- 4-yl}-4-(4-methylpyridin- 2-yl)-1,4-diazepane 261 21% HRMS (ESI+) calculated for C23H31ClN4: 398.223725, found 398.224295. HPLC: Rf 3.44 min, 99.1% purity.

Example 265 2-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)-N-(cyclopropylmethyl)-1,3-thiazole-4-carboxamide

Intermediate 264 (100 mg, 0.38 mmol) and Intermediate 263 (589 mg, 1.91 mmol) were dissolved in DMA (2 mL) and the reaction mixture was heated using a microwave (180° C., absorption high) for 20 min. The reaction mixture was partitioned between DCM (40 mL) and sat aq Na₂CO₃ (20 mL). The organic fraction was washed with brine (20 mL), dried (MgSO₄) and concentrated in vacuo. The residue was dissolved in DCM, stirred with isocyanate resin, for 3 h and filtered. The solvents were removed in vacuo and the residue was purified by column chromatography and reverse phase HPLC to give the title compound (20.4 mg, 11%) as an off-white solid. HRMS (ESI+) calculated for C25H34ClN5OS: 487.217259, found 487.217919. HPLC: Rf 4.14 min, 99.5% purity.

Example 266 2-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)-N-[3-(1H-imidazol-1-yl)propyl]-6-methylpyrimidine-4-carboxamide

Example 266 was prepared similarly to Example 265, using Intermediate 265 instead of Intermediate 264, to give the title compound (2%) as a yellow gum. HRMS (ESI+) calculated for C29H39ClN8O: 550.293536, found 550.293396. HPLC: Rf 3.70 min, 100% purity.

Example 267 1-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-4-(1,3-thiazol-2-yl)-1,4-diazepane

2-Bromothiazole (234 mg, 1.43 mmol) was dissolved in dioxane (2 mL) and sodium tert-butoxide (175 mg, 1.82 mmol), Pd₂(dba)₃ (47.6 mg, 0.05 mmol), Xantphos (84.9 mg, 0.10 mmol) and Intermediate 263 (400 mg, 1.30 mmol) were added. The reaction mixture was heated at 106° C. for 3 d and the solvents were removed in vacuo. The residue was dissolved in DCM, filtered and concentrated in vacuo. The residue was purified by column chromatography and reverse phase HPLC to give the title compound (39.7 mg, 8%) as a yellow gum. HRMS (ESI+) calculated for C20H27ClN4S: 390.164495, found 390.164375. HPLC: Rf 3.38 min, 99.3% purity.

Example 268 6-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)-N-(cyclopropylmethyl)-4-methylpyridine-2-carboxamide

Example 268 was prepared similarly to Example 267, using Intermediate 266 instead of 2-bromothiazole, to give the title compound (4%) as a yellow gum. HRMS (ESI+) calculated for C28H38ClN5O: 495.276489, found 495.277109. HPLC: Rf 4.51 min, 100% purity.

Example 269 2-(4-{1-[(2-chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)-N-(cyclopropylmethyl)pyridine-4-carboxamide

Example 269 was prepared similarly to Example 132, using Intermediate 269 instead of Intermediate 119, to give the title compound (12%) as an off-white solid. HRMS (ESI+) calculated for C27H36ClN5O: 481.260839, found 481.262979. HPLC: Rf 3.84 min, 98.8% purity.

Example 270 6-(4-{1-[(2-Chlorophenyl)methyl]piperidin-4-yl}-1,4-diazepan-1-yl)-N-(cyclopropylmethyl)-5-methoxypyridine-2-carboxamide

Example 270 was prepared similarly to Example 132, using Intermediate 272 instead of Intermediate 119, to give the title compound (6%) as a colourless gum. HRMS (ESI+) calculated for C28H38ClN502: 511.271403, found 511.273083. HPLC: Rf 4.37 min, 100% purity.

Biological Tests

CXCR4 Functional Calcium Assay

The functional activity of test compounds was routinely tested by measuring the ability of compounds to antagonize CXCR4 activity in a dose dependent manner, using a calcium flux Fluorescent Imaging Plate Reader FLIPR assay.

Human CXCR4 transfected HEK293 cells were cultured in Dulbecco's modified Eagles medium containing 4.5 g/L glucose, L-glutamine, pyruvate, 50 □□g/mL Geneticin and 250 □□g/mL hygromycin B and maintained at 37° C. in a humidified, 5% CO₂ controlled atmosphere. Subcultivations were performed every 2-3 d.

At confluence the cells were lifted using Ca²⁺ and Mg²⁺ free PBS/0.02% (w/v) EDTA, spun at 1000 rpm for 3 min and resuspended at 2.5×10⁵ cells/mL. Cells were plated into a 384 well, poly-d-lysine coated, black with clear bottomed plate (Becton Dickinson) at 7500 cells/well. The plates were incubated overnight at 37° C. under 5% CO₂. On the day of the experiment the cells were washed with incubation Buffer (HBSS containing 2.5 mM probenecid, 0.1% w/v BSA and 10 mM HEPES, pH 7.4 at 37° C.). After washing, the cells were loaded with Fluo-4 AM dye (Molecular probes) at 2 □M containing 0.48 □g/mL pluronic acid for 60 min at 37° C. under 5% CO₂. After thorough washing with incubation buffer the cells were preincubated for 10 min at 37° C. before use.

A combined agonist/antagonist protocol was used to measure changes in intracellular calcium concentration. Compound (antagonist) was added to the cell plate using a Fluorometric Imaging Plate Reader (FLIPR) (Molecular Devices, Sunnyvale, Calif., USA). Basal fluorescence was recorded every second for 10 seconds prior to compound addition (10 μl) and fluorescence recorded every second for 1 min then every 6 seconds for a further 1 min. SDF1□ (EC₅₀ concentration) was then added using the FLIPR and fluorescence recorded as described above. Curve-fitting and parameter estimation were carried out using GraphPad Prism 4.0 (GraphPad Software Inc., San Diego, Calif.).

All of the exemplified compounds of the invention were found to be highly potent inhibitors of CXCR4 (See Table 26).

TABLE 26 CXCR4 functional activity (A: <20 nM, B: 20-100 nM, C: 100-500 nM, D: 500-1000 nM) CXCR4 Example fKi 1 C 2 C 3 C 4 C 5 B 6 C 7 B 8 C 9 C 10 C 11 C 12 C 13 C 14 B 15 C 16 C 17 D 18 C 19 C 20 C 21 C 22 C 23 A 24 B 25 C 26 B 27 B 28 A 29 B 30 A 31 A 32 A 33 B 34 A 35 C 36 A 37 C 38 B 39 B 40 A 41 B 42 B 43 B 44 B 45 B 46 B 47 A 48 C 49 C 50 C 51 B 52 B 53 B 54 A 55 B 56 A 57 B 58 C 59 C 60 D 61 C 62 D 63 A 64 B 65 A 66 B 67 D 68 C 69 C 70 B 71 D 72 B 73 B 74 C 75 C 76 B 77 B 78 A 79 A 80 A 81 A 82 A 83 A 84 A 85 B 86 A 87 A 88 A 89 B 90 B 91 C 92 B 93 B 94 C 95 C 96 B 97 C 98 B 99 B 100 B 101 C 102 D 103 C 104 D 105 D 106 A 107 B 108 A 109 B 110 B 111 A 112 D 113 C 114 C 115 C 116 A 117 C 118 B 119 A 120 B 121 A 122 A 123 A 124 B 125 C 126 D 127 B 128 C 129 D 130 C 131 C 132 B 133 B 134 C 135 A 136 C 137 B 138 D 139 C 140 D 141 A 142 B 143 C 144 C 145 A 146 C 147 B 148 B 149 A 150 B 151 C 152 C 153 D 154 C 155 C 156 B 157 C 158 D 159 D 160 C 161 C 162 C 163 C 164 B 165 C 166 C 167 B 168 C 169 D 170 C 171 D 172 C 173 D 174 C 175 A 176 A 177 A 178 B 179 A 180 A 181 B 182 B 183 C 184 B 185 C 186 A 187 B 188 A 189 A 190 A 191 A 192 B 193 A 194 B 195 A 196 B 197 B 198 C 199 D 200 D 201 C 202 D 203 A 204 A 205 A 206 A 207 A 208 C 209 C 210 A 211 B 212 C 213 B 214 C 215 B 216 C 217 C 218 C 219 C 220 B 221 C 222 D 223 D 224 A 225 A 226 A 227 A 228 A 229 C 230 C 231 C 232 C 233 D 234 C 235 C 236 C 237 C 238 C 239 C 240 B 241 B 242 C 243 C 244 B 245 B 246 B 247 B 248 D 249 C 250 B 251 C 252 D 253 D 254 C 255 C 256 B 257 D 258 C 259 D 260 D 261 C 262 D 263 C 264 C 265 D 266 C 267 C 268 C 269 C 270 C Efficacy in HIV In Vitro Assays

Example 30 has demonstrated potent activity in two in vitro assays indicating potential utility of test compounds for treatment of HIV.

Example 30 was tested in an HIV attachment assay, which detects compounds that block HIV-1IIIB (CXCR4-tropic) virus attachment to cells.

The CXCR4-tropic HIV-1 attachment assay uses MAGI-CCR5 cells that naturally express CXCR4 which were engineered to express high levels of CD4 and CCR5 and to contain one copy of the HIV-1 LTR promoter driving expression of the β-galactosidase gene upon HIV-1 Tat transactivation. Cells are incubated with Example 30 and the CXCR4-tropic virus HIV-1_(IIIB) for 3 hours before washing to remove drug and unbound virus. Fresh media is added and the plates are incubated for 48 hours after which antiviral efficacy is measured as the inhibition of β-galactosidase reporter expression and cytotoxicity is monitored by MTS staining.

FIG. 1 shows the effect of Example 30 in the CXCR4-tropic HIV-1 attachment assay. More specifically, FIG. 1 shows that Example 30 inhibits attachment of CXCR4-tropic HIV-1, with an IC50 of 40 nM.

Example 30 was also tested in an HIV antiviral assay that detects compounds that block HIV-1IIIB (CXCR4-tropic) replication via targets in the viral life cycle. The anti-viral assay uses MAGI-CCR5 cells that naturally express CXCR4 which were engineered to express high levels of CD4 and CCR5 and to contain one copy of the HIV-1 LTR promoter driving expression of the β-galactosidase gene upon HIV 1 Tat transactivation. Cells are incubated with Example 30 and the CXCR4-tropic virus HIV-1IIIB for 48 hours after which antiviral efficacy is measured as the inhibition of β-galactosidase reporter expression and cytotoxicity is monitored by MTS staining.

FIG. 2 shows the effect of Example 30 in the HIV anti-viral assay. More specifically, FIG. 2 shows that Example 30 inhibited H1V-1 antiviral activity, with an IC50 of 30 nM.

In Vivo Efficacy

The study investigated the ability of Example 30 alone and in combination with G-CSF to induce in vivo mobilization of white blood cells in C57BL/6 mice, as well as hematopoietic progenitors from bone marrow to peripheral blood as assessed by the evaluation of the frequency of colony forming cell colonies (CFC). Peripheral blood samples from each test group were collected 1 hour post injection. The white blood cell count (WBC) was determined from the peripheral blood collected for each individual mouse. Clonogenic progenitors of the multipotential (CFU-GEMM) lineages were assessed. Peripheral blood cells were added to MethoCult® 3434 in triplicate cultures for plating (0.5-3×10⁵ cells/dish). Cultures were incubated for 8 days at 37° C., 5% CO₂ in humidified incubators. CFU-GEMM colony number was enumerated microscopically using an inverted microscope from appropriately plated culture dishes.

FIG. 3 shows a significant increase in circulating white blood cells (WBC) 1 hour after treatment with Example 30 when compared to mice in the vehicle control group. Treatment with G-CSF also resulted in an increase in circulating WBC compared to the vehicle group. There was a significant increase in WBC with Example 30 in combination with G-CSF after 1 hour when compared to mice treated with G-CSF alone.

FIG. 4 shows the evaluation of hematopoietic progenitors following treatment with Example 30 and/or G-CSF. In particular, FIG. 4 shows a significant increase in multipotential mixed hematopoietic progenitors (CFU-GEMM/ml) one hour after treatment with Example 30 in combination with G-CSF when compared to G-CSF treatment alone. The results shown in FIGS. 3 and 4 support the utility of Example 30 and the compounds of the invention generally in stem cell apheresis, particularly therapeutic uses of stem cell apheresis. 

The invention claimed is:
 1. A method of treating a viral infection in a subject in need thereof, comprising administering to the subject an effective amount of a compound having a structure represented by a formula:

wherein: R¹ is selected from cyano, —COR³, —CONR³R⁴, and heteroaryl; Y is a radical of formula (L), which is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, C₁₋₄-alkoxy, and fluoro-C₁₋₄-alkoxy, wherein the bond marked * is attached to

and the bond marked ** is attached to R²:

n is 1 or 2; R²⁰ is hydrogen or C₁₋₄-alkyl; R² is selected from radicals of formulae (N)-(S) inclusive, any of which is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl, and fluoro-C₁₋₄-alkoxy, wherein the bond marked * is attached to Y;

o and p are each independently 1 or 2; W is O or NR⁹; R³ is selected from hydrogen, C₁₋₆-alkyl, C₃₋₅-cycloalkyl, C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl, heterocyclyl-C₁₋₄-alkyl, C₆₋₁₀-aryl, heteroaryl, C₆₋₁₀-aryl-C₁₋₄-alkyl, and heteroaryl-C₁₋₄-alkyl, wherein: (i) the C₁₋₆-alkyl, the C₃₋₅-cycloalkyl, the heterocyclyl, the heterocyclyl part of the heterocyclyl-C₁₋₄-alkyl, the C₁₋₄-alkyl part of the heterocyclyl-C₁₋₄-alkyl, the C₆₋₁₀-aryl-C₁₋₄-alkyl, or the heteroaryl-C₁₋₄-alkyl is optionally substituted with one or more substituents independently selected from fluorine, hydroxy, cyano, C₁₋₄-alkoxy, and —NR^(5A)R^(5B), and (ii) the C₆₋₁₀-aryl, the heteroaryl, the C₆₋₁₀-aryl part of the C₆₋₁₀-aryl-C₁₋₄-alkyl or the heteroaryl part of the heteroaryl-C₁₋₄-alkyl is optionally substituted with one or more substituents independently selected from halogen, hydroxy, cyano, nitro, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl, fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl, fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl, —NR^(5A)R^(5B), —C₁₋₄-alkyl-NR^(5A)R^(5B), —NR⁴C(O)O—C₁₋₄alkyl, —NR⁴C(O)—C₁₋₄alkyl, —NR⁴C(O)O-fluoro-C₁₋₄alkyl, —NR⁴C(O)-fluoro-C₁₋₄alkyl, —NR⁴C(O)NR^(5A)R^(5B), —C(O)NR^(5A)R^(5B), —C(O)R⁴, —C(O)OR⁴, —NR⁴S(O)₂—C₁₋₄alkyl, and —NR⁴S(O)₂-fluoro-C₁₋₄alkyl; R⁴, R^(5A), and R^(5B) are each independently selected from hydrogen, C₁₋₄-alkyl, and fluoro-C₁₋₄-alkyl, or R^(5A) and R^(5B), together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring or a heteroaryl ring, the ring being optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl, and C₁₋₄-alkoxy, or R³ and R⁴, together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring or a heteroaryl ring, the ring being optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl, and C₁₋₄-alkoxy; and R⁶ is selected from C₁₋₆-alkyl, C₃₋₅-cycloalkyl, C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl, heterocyclyl-C₁₋₄-alkyl, and C₆₋₁₀-aryl, wherein: (iii) the C₁₋₆-alkyl, the C₃₋₅-cycloalkyl, the heterocyclyl, or the C₁₋₄-alkyl part of the heterocyclyl-C₁₋₄-alkyl, or the heterocyclyl part of the heterocyclyl-C₁₋₄-alkyl is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, and C₁₋₄-alkoxy, and (iv) the C₆₋₁₀-aryl is optionally substituted with one or more substituents independently selected from halogen, hydroxyl, cyano, nitro, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl, fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl, and fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl; R⁷ is selected from C₁₋₆-alkyl, C₃₋₅-cycloalkyl, C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl, heterocyclyl-C₁₋₄-alkyl, C₆₋₁₀-aryl-C₁₋₄-alkyl, C₆₋₁₀-aryl, and —NR^(10A)R^(10B), wherein: (v) the C₁₋₆-alkyl, the C₃₋₅-cycloalkyl, the heterocyclyl, the C₁₋₄-alkyl part of the heterocyclyl-C₁₋₄-alkyl or the C₆₋₁₀-aryl-C₁₋₄-alkyl, or the heterocyclyl part of the heterocyclyl-C₁₋₄-alkyl is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, and C₁₋₄-alkoxy, and (vi) the C₆₋₁₀-aryl or the C₆₋₁₀-aryl part of the C₆₋₁₀-aryl-C₁₋₄-alkyl is optionally substituted with one or more substituents independently selected from halogen, hydroxy, cyano, nitro, C₁₋₄-alkyl, C₁₋₄-alkoxy, fluoro-C₁₋₄-alkyl, fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl, and fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl; R^(8A), R^(8B) and R⁹ are each independently selected from hydrogen, C₃₋₅-cycloalkyl, Cue-alkyl, and C₆₋₁₀-aryl-C₁₋₄-alkyl wherein any alkyl residue or cycloalkyl or C₆₋₁₀-aryl ring system is optionally substituted with one or more substituents independently selected from halogen, hydroxyl, and C₁₋₄-alkoxy, or R^(8A) and R^(8B), together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring which is optionally fused to a C₆₋₁₀-aryl or heteroaryl ring system, the 4- to 7-membered saturated heterocyclic ring or the C₆₋₁₀-aryl or heteroaryl ring systems being optionally substituted with one or more substituents independently selected from halogen, hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl, and C₁₋₄-alkoxy; and R^(10A) and R^(10B) are each independently selected from hydrogen and C₁₋₆-alkyl, wherein the C₁₋₆-alkyl is optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, and C₁₋₄-alkoxy, or R^(10A) and R^(10B), together with the nitrogen atom to which they are bound, form a 4- to 7-membered saturated heterocyclic ring or a heteroaryl ring, optionally substituted with one or more substituents independently selected from fluorine, hydroxyl, C₁₋₄-alkyl, fluoro-C₁₋₄-alkyl, and C₁₋₄-alkoxy, or a pharmaceutically acceptable salt thereof.
 2. The method according to claim 1, wherein the viral infection is HIV/AIDS.
 3. The method according to claim 1, wherein R¹ is —CONR³R⁴.
 4. The method according to claim 3, wherein R⁴ is hydrogen or methyl.
 5. The method according to claim 3, wherein R³ is tetrahydropyranyl, isopropylmethyl, tetrahydropyranylmethyl, imidazolylethyl, methoxyethyl, N-methylimidazolylmethyl, tetrahydrofuranylmethyl, 1-fluoroethyl, oxazolylmethyl, pyridylmethyl, 2,2-difluoromethyl, tetrahydrofuranyl, methyl, ethyl, n- or iso-propyl, n-sec- or n-sec-or tert-butyl, cyclopropyl, hydroxyethyl, cyanoethyl, phenyl, chlorophenyl, methoxyphenyl, methylphenyl, hydroxyphenyl, thiazoloylmethyl, indolyl, methoxypropyl, tetrahydroisoquinolinyl, furylmethyl, pyridylethyl, thiazolyl, or cyclopropylmethyl.
 6. The method according to claim 3, wherein R³ is pyridyl optionally substituted with one or more substituents selected from halogen, C₁₋₄-alkyl, C₁₋₄-alkoxy, and fluoro-C₁₋₄-alkyl.
 7. The method according to claim 1, wherein R⁶ is C₁₋₆-alkyl, C₁₋₆ fluoroalkyl, C₃₋₅ cycloalkyl, or C₃₋₅ fluorocycloalkyl.
 8. The method according to claim 1, wherein R is C₃₋₅-cycloalkyl-C₁₋₄-alkyl, heterocyclyl, or heterocyclyl-C₁₋₄-alkyl, and wherein R⁴ is hydrogen or methyl.
 9. The method according to claim 1, wherein R¹ is selected from cyano, —COR³, —CONR³R⁴, and heteroaryl, wherein the heteroaryl has 5 to 10 ring atoms in which one or more of the ring atoms is N, S, or O, and is optionally substituted with one or more groups selected from fluoro, chloro, bromo, hydroxy, cyano, nitro, C₁₋₆-alkyl, C₃₋₅-cycloalkyl, C₁₋₄-alkoxy, fluoro-C₁₋₆-alkyl, fluoro-C₁₋₄-alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl, fluoro-C₁₋₄-alkoxy-C₁₋₄-alkyl, C₆₋₁₀-aryl, —NR^(5A)R^(5B), —C₁₋₄-alkyl-NR^(5A)R^(5B), —NR⁴C(O)O—C₁₋₄-alkyl, —NR⁴C(O)—C₁₋₄-alkyl, —NR⁴C(O)O-fluoro-C₁₋₄-alkyl, —NR⁴C(0)-fluoro-C₁₋₄-alkyl, —NR⁴C(O)NR^(5A)R^(5B), —C(O)NR^(5A)R^(5B), —C(O)R⁴, —C(O)OR⁴, —NR⁴S(O)₂—C₁₋₄-alkyl, and —NR⁴S(O)₂-fluoro-C M-alkyl.
 10. The method according to claim 1, wherein R² is


11. The method according to claim 1, wherein R⁶ is isopropyl.
 12. The method according to claim 1, wherein R¹ is heteroaryl.
 13. The method according to claim 1, wherein the compound has a structure represented by a formula:


14. The method according to claim 1, wherein the compound is selected from: 